Fixes #125.

* src/kripke/kripkegraph.hh, src/ta/ta.cc, src/ta/ta.hh,
src/ta/taexplicit.cc, src/ta/taexplicit.hh, src/ta/taproduct.cc,
src/ta/taproduct.hh, src/ta/tgtaproduct.cc, src/ta/tgtaproduct.hh,
src/taalgos/dot.cc, src/taalgos/emptinessta.cc,
src/taalgos/emptinessta.hh, src/taalgos/minimize.cc,
src/taalgos/reachiter.cc, src/taalgos/tgba2ta.cc, src/twa/twa.hh,
src/twa/twagraph.hh, src/twa/twaproduct.cc, src/twa/twaproduct.hh,
src/twaalgos/compsusp.cc, src/twaalgos/gtec/gtec.cc,
src/twaalgos/ltl2tgba_fm.cc, src/twaalgos/reachiter.cc,
src/twaalgos/stutter.cc: Adjust.

This fixes #116.

* src/twa/twa.hh: Rename those methods.
* NEWS: Document the renamings.
* doc/org/hoa.org, doc/org/tut21.org, src/parseaut/parseaut.yy,
src/tests/ikwiad.cc, src/twa/twagraph.hh,
src/twaalgos/are_isomorphic.cc, src/twaalgos/complete.cc,
src/twaalgos/degen.cc, src/twaalgos/dot.cc, src/twaalgos/dtbasat.cc,
src/twaalgos/dtgbasat.cc, src/twaalgos/hoa.cc, src/twaalgos/isdet.cc,
src/twaalgos/isunamb.cc, src/twaalgos/lbtt.cc,
src/twaalgos/minimize.cc, src/twaalgos/postproc.cc,
src/twaalgos/product.cc, src/twaalgos/randomgraph.cc,
src/twaalgos/remfin.cc, src/twaalgos/sbacc.cc,
src/twaalgos/simulation.cc, src/twaalgos/stutter.cc,
src/twaalgos/totgba.cc: Adjust.

* src/twa/twa.hh, src/ta/ta.hh (current_state,
current_acceptance_conditions, current_condition): Rename as...
(dst, acc, cond): ... these.
* iface/ltsmin/ltsmin.cc, src/kripke/fairkripke.cc,
src/kripke/fairkripke.hh, src/kripke/kripke.cc,
src/kripke/kripke.hh, src/kripke/kripkeexplicit.cc,
src/kripke/kripkeexplicit.hh, src/kripke/kripkeprint.cc,
src/ta/taexplicit.cc, src/ta/taexplicit.hh, src/ta/taproduct.cc,
src/ta/taproduct.hh, src/ta/tgtaproduct.cc, src/ta/tgtaproduct.hh,
src/taalgos/dot.cc, src/taalgos/emptinessta.cc,
src/taalgos/minimize.cc, src/taalgos/reachiter.cc,
src/taalgos/tgba2ta.cc, src/twa/taatgba.cc, src/twa/taatgba.hh,
src/twa/twagraph.hh, src/twa/twaproduct.cc,
src/twa/twasafracomplement.cc, src/twaalgos/bfssteps.cc,
src/twaalgos/bfssteps.hh, src/twaalgos/compsusp.cc,
src/twaalgos/copy.cc, src/twaalgos/emptiness.cc,
src/twaalgos/gtec/gtec.cc, src/twaalgos/gv04.cc,
src/twaalgos/lbtt.cc, src/twaalgos/ltl2tgba_fm.cc,
src/twaalgos/magic.cc, src/twaalgos/minimize.cc,
src/twaalgos/ndfs_result.hxx, src/twaalgos/reachiter.cc,
src/twaalgos/se05.cc, src/twaalgos/stats.cc,
src/twaalgos/stutter.cc, src/twaalgos/tau03.cc,
src/twaalgos/tau03opt.cc, wrap/python/tests/interdep.py: Adjust.
* NEWS: Mention the renamings.

* doc/org/tut01.org, doc/tl/tl.tex, src/bin/common_r.hh,
src/bin/ltlfilt.cc, src/tests/equalsf.cc, src/tests/ikwiad.cc,
src/tests/randtgba.cc, src/tests/reduc.cc, src/tests/syntimpl.cc,
src/tl/nenoform.cc, src/tl/randomltl.cc, src/tl/randomltl.hh,
src/tl/simplify.cc, src/tl/simplify.hh, src/twaalgos/ltl2tgba_fm.cc,
src/twaalgos/ltl2tgba_fm.hh, src/twaalgos/stutter.cc,
src/twaalgos/translate.cc, src/twaalgos/translate.hh,
wrap/python/ajax/spotcgi.in, wrap/python/spot.py,
wrap/python/tests/interdep.py: Rename ltl_simplifier to tl_simplifier.
* NEWS: Mention it.

The previous code was sometime doing the work of remove_fin() in
addition to complementing the acceptance conditions.  This separate
the two operations clearly.  Also the specialized code for
complementing weak automata is now a specialized code for remove_fin()
on weak automata.

* src/twaalgos/dtgbacomp.hh, src/twaalgos/dtgbacomp.cc: Rename as ...
* src/twaalgos/complement.hh, src/twaalgos/complement.cc: ... these.
* src/twaalgos/Makefile.am: Adjust.
* src/twaalgos/complement.hh (dtgba_complement): Rename as ...
(dtwa_complement): ... this, and restrict the purpose to completion
and accetance complementation.  Further acceptance simplification
can be done with remove_fin() and to_generalized_buchi().
* src/twaalgos/remfin.cc (remove_fin): Specialize handling of weak
automata using the code that was originally in dtgba_complement().
Also mark the output as state-based when the input has to Inf.
* src/twaalgos/postproc.cc, src/twaalgos/postproc.hh: Make sure
scc_filter is always called after to_generalized_buchi().
* bench/stutter/stutter_invariance_randomgraph.cc,
src/bin/ltlcross.cc, src/tests/ikwiad.cc, src/twaalgos/minimize.cc,
src/twaalgos/powerset.cc, src/twaalgos/stutter.cc: Adjust usage.
* src/tests/dstar.test, src/tests/ltl2dstar4.test,
src/tests/remfin.test: Adjust expected outputs.
* wrap/python/spot_impl.i: Export dtwa_complement().

* src/twaalgos/dupexp.cc, src/twaalgos/dupexp.hh: Rename to...
* src/twaalgos/copy.cc, src/twaalgos/copy.hh: ... these.
Get rid of dupexp_bfs, rename dupexp_dfs as copy, and add
an option to preserve named states.
* src/twaalgos/Makefile.am, src/tests/dupexp.test,
src/tests/ikwiad.cc, src/tests/sccsimpl.test,
src/twa/twagraph.hh, src/twaalgos/dot.cc,
src/twaalgos/stutter.cc, wrap/python/spot_impl.i: Adjust.
* NEWS: Mention this change.

* NEWS: Mention it.
* bench/stutter/stutter_invariance_formulas.cc,
bench/stutter/stutter_invariance_randomgraph.cc, doc/mainpage.dox,
doc/org/tut01.org, doc/org/tut02.org, doc/org/tut10.org, doc/tl/tl.tex,
iface/ltsmin/ltsmin.cc, iface/ltsmin/ltsmin.hh,
iface/ltsmin/modelcheck.cc, src/bin/autfilt.cc,
src/bin/common_aoutput.cc, src/bin/common_aoutput.hh,
src/bin/common_finput.cc, src/bin/common_finput.hh,
src/bin/common_output.cc, src/bin/common_output.hh, src/bin/common_r.hh,
src/bin/common_trans.cc, src/bin/common_trans.hh, src/bin/dstar2tgba.cc,
src/bin/genltl.cc, src/bin/ltl2tgba.cc, src/bin/ltl2tgta.cc,
src/bin/ltlcross.cc, src/bin/ltldo.cc, src/bin/ltlfilt.cc,
src/bin/ltlgrind.cc, src/bin/randaut.cc, src/bin/randltl.cc,
src/kripke/kripkeexplicit.cc, src/kripke/kripkeexplicit.hh,
src/kripkeparse/kripkeparse.yy, src/kripkeparse/public.hh,
src/ltlparse/fmterror.cc, src/ltlparse/ltlparse.yy,
src/ltlparse/ltlscan.ll, src/ltlparse/parsedecl.hh,
src/ltlparse/public.hh, src/parseaut/parseaut.yy,
src/parseaut/public.hh, src/tests/checkpsl.cc, src/tests/checkta.cc,
src/tests/complementation.cc, src/tests/consterm.cc,
src/tests/emptchk.cc, src/tests/equalsf.cc, src/tests/ikwiad.cc,
src/tests/kind.cc, src/tests/length.cc, src/tests/ltlprod.cc,
src/tests/ltlrel.cc, src/tests/parse.test,
src/tests/parse_print_test.cc, src/tests/randtgba.cc,
src/tests/readltl.cc, src/tests/reduc.cc, src/tests/syntimpl.cc,
src/tests/taatgba.cc, src/tests/tostring.cc, src/tests/tostring.test,
src/tl/apcollect.cc, src/tl/apcollect.hh, src/tl/contain.cc,
src/tl/contain.hh, src/tl/declenv.cc, src/tl/declenv.hh,
src/tl/defaultenv.cc, src/tl/defaultenv.hh, src/tl/dot.cc,
src/tl/dot.hh, src/tl/environment.hh, src/tl/exclusive.cc,
src/tl/exclusive.hh, src/tl/formula.cc, src/tl/formula.hh,
src/tl/length.cc, src/tl/length.hh, src/tl/mark.cc, src/tl/mark.hh,
src/tl/mutation.cc, src/tl/mutation.hh, src/tl/nenoform.cc,
src/tl/nenoform.hh, src/tl/print.cc, src/tl/print.hh,
src/tl/randomltl.cc, src/tl/randomltl.hh, src/tl/relabel.cc,
src/tl/relabel.hh, src/tl/remove_x.cc, src/tl/remove_x.hh,
src/tl/simpfg.cc, src/tl/simpfg.hh, src/tl/simplify.cc,
src/tl/simplify.hh, src/tl/snf.cc, src/tl/snf.hh, src/tl/unabbrev.cc,
src/tl/unabbrev.hh, src/twa/bdddict.cc, src/twa/bdddict.hh,
src/twa/bddprint.cc, src/twa/formula2bdd.cc, src/twa/formula2bdd.hh,
src/twa/taatgba.cc, src/twa/taatgba.hh, src/twa/twa.hh,
src/twa/twagraph.cc, src/twa/twagraph.hh, src/twaalgos/compsusp.cc,
src/twaalgos/compsusp.hh, src/twaalgos/ltl2taa.cc,
src/twaalgos/ltl2taa.hh, src/twaalgos/ltl2tgba_fm.cc,
src/twaalgos/ltl2tgba_fm.hh, src/twaalgos/minimize.cc,
src/twaalgos/minimize.hh, src/twaalgos/neverclaim.cc,
src/twaalgos/postproc.cc, src/twaalgos/postproc.hh,
src/twaalgos/powerset.cc, src/twaalgos/powerset.hh,
src/twaalgos/randomgraph.cc, src/twaalgos/randomgraph.hh,
src/twaalgos/relabel.cc, src/twaalgos/relabel.hh,
src/twaalgos/remprop.cc, src/twaalgos/remprop.hh, src/twaalgos/stats.cc,
src/twaalgos/stats.hh, src/twaalgos/stutter.cc, src/twaalgos/stutter.hh,
src/twaalgos/translate.cc, src/twaalgos/translate.hh,
wrap/python/spot_impl.i: Remove the ltl namespace.

The ltl prefix does not make a lot of sens anymore (since we
support psl as well).  ltlast/ and ltlenv/ were almost empty.
And ltlvisit/ did not contain any visitor anymore.

* src/ltlvisit/, src/ltlast/, src/ltlenv/: Merge into...
* src/tl/: ...this.
* NEWS: Mention the change.
* README, bench/stutter/stutter_invariance_formulas.cc,
bench/stutter/stutter_invariance_randomgraph.cc, configure.ac,
doc/org/tut01.org, doc/org/tut02.org, doc/org/tut10.org, doc/tl/tl.tex,
iface/ltsmin/ltsmin.hh, iface/ltsmin/modelcheck.cc, src/Makefile.am,
src/bin/autfilt.cc, src/bin/common_output.cc, src/bin/common_output.hh,
src/bin/common_r.hh, src/bin/common_trans.cc, src/bin/genltl.cc,
src/bin/ltl2tgba.cc, src/bin/ltl2tgta.cc, src/bin/ltlcross.cc,
src/bin/ltldo.cc, src/bin/ltlfilt.cc, src/bin/ltlgrind.cc,
src/bin/randltl.cc, src/kripke/kripkeexplicit.hh,
src/kripkeparse/public.hh, src/parseaut/public.hh, src/priv/accmap.hh,
src/ta/taexplicit.hh, src/ta/tgtaexplicit.hh, src/tests/equalsf.cc,
src/tests/ikwiad.cc, src/tests/length.cc, src/tests/ltlrel.cc,
src/tests/randtgba.cc, src/tests/readltl.cc, src/tests/reduc.cc,
src/tests/syntimpl.cc, src/tests/taatgba.cc, src/tests/tostring.cc,
src/tests/twagraph.cc, src/twa/acc.hh, src/twa/bdddict.cc,
src/twa/bdddict.hh, src/twa/bddprint.cc, src/twa/taatgba.cc,
src/twa/taatgba.hh, src/twa/twa.hh, src/twa/twagraph.cc,
src/twa/twagraph.hh, src/twa/twasafracomplement.cc,
src/twaalgos/compsusp.cc, src/twaalgos/compsusp.hh,
src/twaalgos/dtgbasat.cc, src/twaalgos/hoa.cc,
src/twaalgos/isweakscc.cc, src/twaalgos/lbtt.cc,
src/twaalgos/ltl2taa.cc, src/twaalgos/ltl2taa.hh,
src/twaalgos/ltl2tgba_fm.cc, src/twaalgos/ltl2tgba_fm.hh,
src/twaalgos/minimize.hh, src/twaalgos/neverclaim.cc,
src/twaalgos/randomgraph.hh, src/twaalgos/relabel.hh,
src/twaalgos/remprop.hh, src/twaalgos/stats.cc, src/twaalgos/stutter.cc,
src/twaalgos/translate.hh, wrap/python/spot_impl.i,
src/ltlparse/ltlparse.yy, src/ltlparse/public.hh: Adjust.

Flatten the formula ltl::formula hiearchy into a single ltl::vnode that
has an enumerator to distinguish the types of node, and a common
interface to access children, update reference counts, etc.  The
ltl::formula class is now a thin wrapper around an ltl::vnode pointer to
keep track of reference counts automatically.  Visitor are not used
anymore; we now have map() and traversor() methods that are more
concise.

This basically fixes #43, but should be followed by some fine tuning
that should now be localized to the formula.hh and formula.cc files.

Some statistics about this patch.  I started working on it on Sep 9, had
a first compiling version two weeks later on Sep 22, and it then took 5
days to fixes the ~70 distincts bugs that were introduced during the
conversion.  About 13200 lines were modified, and one third of those
were removed.

* src/ltlast/formula.cc, src/ltlast/formula.hh: Complete rewrite,
including what was in separate nearby files.
* src/ltlast/allnodes.hh, src/ltlast/atomic_prop.cc,
src/ltlast/atomic_prop.hh, src/ltlast/binop.cc, src/ltlast/binop.hh,
src/ltlast/bunop.cc, src/ltlast/bunop.hh, src/ltlast/constant.cc,
src/ltlast/constant.hh, src/ltlast/multop.cc, src/ltlast/multop.hh,
src/ltlast/unop.cc, src/ltlast/unop.hh, src/ltlvisit/dump.cc,
src/ltlvisit/dump.hh, src/ltlast/predecl.hh: Delete these files.  Their
feature have been merged in formula.hh and formula.cc.
* src/ltlast/visitor.hh, src/ltlvisit/clone.cc, src/ltlvisit/clone.hh,
src/ltlvisit/dump.hh, src/ltlvisit/postfix.cc, src/ltlvisit/postfix.hh:
Delete these files, as we do not use visitors anymore.
* bench/stutter/stutter_invariance_formulas.cc,
bench/stutter/stutter_invariance_randomgraph.cc, doc/org/tut01.org,
doc/org/tut02.org, doc/org/tut10.org, doc/org/tut22.org,
iface/ltsmin/ltsmin.cc, iface/ltsmin/ltsmin.hh,
iface/ltsmin/modelcheck.cc, src/bin/autfilt.cc,
src/bin/common_aoutput.cc, src/bin/common_aoutput.hh,
src/bin/common_finput.cc, src/bin/common_finput.hh,
src/bin/common_output.cc, src/bin/common_output.hh,
src/bin/common_trans.cc, src/bin/common_trans.hh, src/bin/dstar2tgba.cc,
src/bin/genltl.cc, src/bin/ltl2tgba.cc, src/bin/ltl2tgta.cc,
src/bin/ltlcross.cc, src/bin/ltldo.cc, src/bin/ltlfilt.cc,
src/bin/ltlgrind.cc, src/bin/randaut.cc, src/bin/randltl.cc,
src/kripke/kripkeexplicit.cc, src/kripke/kripkeexplicit.hh,
src/kripkeparse/kripkeparse.yy, src/ltlast/Makefile.am,
src/ltlenv/declenv.cc, src/ltlenv/declenv.hh, src/ltlenv/defaultenv.cc,
src/ltlenv/defaultenv.hh, src/ltlenv/environment.hh,
src/ltlparse/ltlparse.yy, src/ltlparse/public.hh,
src/ltlvisit/Makefile.am, src/ltlvisit/apcollect.cc,
src/ltlvisit/apcollect.hh, src/ltlvisit/contain.cc,
src/ltlvisit/contain.hh, src/ltlvisit/dot.cc, src/ltlvisit/dot.hh,
src/ltlvisit/exclusive.cc, src/ltlvisit/exclusive.hh,
src/ltlvisit/length.cc, src/ltlvisit/length.hh, src/ltlvisit/mark.cc,
src/ltlvisit/mark.hh, src/ltlvisit/mutation.cc,
src/ltlvisit/mutation.hh, src/ltlvisit/nenoform.cc,
src/ltlvisit/nenoform.hh, src/ltlvisit/print.cc, src/ltlvisit/print.hh,
src/ltlvisit/randomltl.cc, src/ltlvisit/randomltl.hh,
src/ltlvisit/relabel.cc, src/ltlvisit/relabel.hh,
src/ltlvisit/remove_x.cc, src/ltlvisit/remove_x.hh,
src/ltlvisit/simpfg.cc, src/ltlvisit/simpfg.hh,
src/ltlvisit/simplify.cc, src/ltlvisit/simplify.hh, src/ltlvisit/snf.cc,
src/ltlvisit/snf.hh, src/ltlvisit/unabbrev.cc, src/ltlvisit/unabbrev.hh,
src/parseaut/parseaut.yy, src/ta/taexplicit.cc, src/ta/tgtaexplicit.cc,
src/taalgos/minimize.cc, src/taalgos/tgba2ta.cc, src/tests/bare.test,
src/tests/checkpsl.cc, src/tests/checkta.cc,
src/tests/complementation.cc, src/tests/consterm.cc,
src/tests/emptchk.cc, src/tests/equalsf.cc, src/tests/ikwiad.cc,
src/tests/isop.test, src/tests/kind.cc, src/tests/length.cc,
src/tests/ltldo.test, src/tests/ltlfilt.test, src/tests/ltlgrind.test,
src/tests/ltlprod.cc, src/tests/ltlrel.cc,
src/tests/parse_print_test.cc, src/tests/parseaut.test,
src/tests/parseerr.test, src/tests/randtgba.cc, src/tests/readltl.cc,
src/tests/reduc.cc, src/tests/syntimpl.cc, src/tests/taatgba.cc,
src/tests/tostring.cc, src/tests/twagraph.cc, src/tests/utf8.test,
src/twa/acc.cc, src/twa/bdddict.cc, src/twa/bdddict.hh,
src/twa/bddprint.cc, src/twa/formula2bdd.cc, src/twa/formula2bdd.hh,
src/twa/taatgba.cc, src/twa/taatgba.hh, src/twa/twa.cc, src/twa/twa.hh
src/twa/twagraph.cc, src/twa/twagraph.hh, src/twa/twasafracomplement.cc,
src/twaalgos/compsusp.cc, src/twaalgos/compsusp.hh,
src/twaalgos/dtgbasat.cc, src/twaalgos/hoa.cc, src/twaalgos/lbtt.cc,
src/twaalgos/ltl2taa.cc, src/twaalgos/ltl2taa.hh,
src/twaalgos/ltl2tgba_fm.cc, src/twaalgos/ltl2tgba_fm.hh,
src/twaalgos/minimize.cc, src/twaalgos/minimize.hh,
src/twaalgos/neverclaim.cc, src/twaalgos/postproc.cc,
src/twaalgos/postproc.hh, src/twaalgos/powerset.cc,
src/twaalgos/powerset.hh, src/twaalgos/randomgraph.cc,
src/twaalgos/remprop.cc, src/twaalgos/remprop.hh, src/twaalgos/stats.cc,
src/twaalgos/stats.hh, src/twaalgos/stutter.cc, src/twaalgos/stutter.hh,
src/twaalgos/translate.cc, src/twaalgos/translate.hh,
wrap/python/ajax/spotcgi.in, wrap/python/spot.py,
wrap/python/spot_impl.i, wrap/python/Makefile.am,
wrap/python/tests/automata-io.ipynb, wrap/python/tests/formulas.ipynb,
wrap/python/tests/ltl2tgba.py, wrap/python/tests/ltlparse.py,
wrap/python/tests/ltlsimple.py, wrap/python/tests/randltl.ipynb: Adjust
to use the new interface.
* src/sanity/style.test: Accept more C++11 patterns.
* NEWS: Mention the change.

* doc/org/tut22.org, src/ltlvisit/apcollect.cc,
src/ltlvisit/apcollect.hh, src/parseaut/parseaut.yy,
src/tests/ikwiad.cc, src/tests/tgbagraph.test,
src/tests/twagraph.cc, src/twa/twa.cc,
src/twa/twa.hh, src/twaalgos/ltl2tgba_fm.cc,
src/twaalgos/randomgraph.cc, src/twaalgos/relabel.cc,
src/twaalgos/stutter.cc, src/twaalgos/stutter.hh: here.

And in fact, rename most "trans*" as "edges*", because that what they
really are.

* src/bin/autfilt.cc, src/bin/ltlcross.cc, src/bin/randaut.cc,
src/dstarparse/dra2ba.cc, src/dstarparse/dstarparse.yy,
src/dstarparse/nra2nba.cc, src/dstarparse/nsa2tgba.cc,
src/graph/graph.hh, src/graph/ngraph.hh, src/ltlvisit/exclusive.cc,
src/parseaut/parseaut.yy, src/tests/complementation.cc,
src/tests/graph.cc, src/tests/ltl2tgba.cc, src/tests/ngraph.cc,
src/tests/twagraph.cc, src/twa/twagraph.cc, src/twa/twagraph.hh,
src/twa/twamask.hh, src/twaalgos/are_isomorphic.cc,
src/twaalgos/are_isomorphic.hh, src/twaalgos/canonicalize.cc,
src/twaalgos/cleanacc.cc, src/twaalgos/complete.cc,
src/twaalgos/compsusp.cc, src/twaalgos/cycles.cc,
src/twaalgos/degen.cc, src/twaalgos/dot.cc, src/twaalgos/dtbasat.cc,
src/twaalgos/dtgbacomp.cc, src/twaalgos/dtgbasat.cc,
src/twaalgos/dupexp.cc, src/twaalgos/emptiness.cc,
src/twaalgos/isunamb.cc, src/twaalgos/isweakscc.cc,
src/twaalgos/ltl2tgba_fm.cc, src/twaalgos/mask.hh,
src/twaalgos/minimize.cc, src/twaalgos/postproc.cc,
src/twaalgos/powerset.cc, src/twaalgos/product.cc,
src/twaalgos/randomgraph.cc, src/twaalgos/randomize.cc,
src/twaalgos/randomize.hh, src/twaalgos/relabel.cc,
src/twaalgos/remfin.cc, src/twaalgos/safety.cc, src/twaalgos/sbacc.cc,
src/twaalgos/sccfilter.cc, src/twaalgos/sepsets.cc,
src/twaalgos/simulation.cc, src/twaalgos/stutter.cc,
src/twaalgos/totgba.cc: Rename these.

* src/twa/twa.hh (num_sets): New method.  Delegating to acc_.
* src/twa/twagraph.hh, src/twa/twaproduct.cc, src/twa/twaproxy.cc,
src/twaalgos/degen.cc, src/twaalgos/dot.cc, src/twaalgos/dtgbacomp.cc,
src/twaalgos/dtgbasat.cc, src/twaalgos/gv04.cc, src/twaalgos/hoa.cc,
src/twaalgos/lbtt.cc, src/twaalgos/magic.cc, src/twaalgos/mask.cc,
src/twaalgos/ndfs_result.hxx, src/twaalgos/postproc.cc,
src/twaalgos/powerset.cc, src/twaalgos/product.cc,
src/twaalgos/remfin.cc, src/twaalgos/se05.cc,
src/twaalgos/simulation.cc, src/twaalgos/stats.cc,
src/twaalgos/stutter.cc, src/twaalgos/tau03.cc,
src/twaalgos/tau03opt.cc, src/twaalgos/totgba.cc: Simplify
acc().num_sets() into num_sets().

* src/twa/twa.hh: Support this new property.
* src/twaalgos/stutter.cc: Set it if needed.
* src/twaalgos/hoa.cc: Output it.
* src/tests/stutter-tgba.test: More tests.

This currently only allows extra check for stutter invariance.

* src/bin/common_aoutput.cc: Add check option,
and test stutter invariance.
* src/twaalgos/stutter.cc, src/twaalgos/stutter.hh
(check_stutter_invariance): New function.
* src/tests/stutter-tgba.test: Test it.

Automatic mass renaming.

* src/tgbaalgos/: Rename as...
* src/twaalgos/: ... this.
* README, configure.ac, iface/ltsmin/modelcheck.cc, src/Makefile.am,
src/bin/autfilt.cc, src/bin/common_aoutput.cc,
src/bin/common_aoutput.hh, src/bin/common_output.hh,
src/bin/common_post.hh, src/bin/dstar2tgba.cc, src/bin/ltl2tgba.cc,
src/bin/ltl2tgta.cc, src/bin/ltlcross.cc, src/bin/ltldo.cc,
src/bin/ltlfilt.cc, src/bin/randaut.cc, src/dstarparse/dra2ba.cc,
src/dstarparse/nra2nba.cc, src/dstarparse/nsa2tgba.cc,
src/graphtest/twagraph.cc, src/kripke/kripkeprint.cc,
src/ltlvisit/contain.cc, src/ltlvisit/contain.hh,
src/ltlvisit/exclusive.cc, src/taalgos/emptinessta.hh,
src/tgbatest/checkpsl.cc, src/tgbatest/checkta.cc,
src/tgbatest/complementation.cc, src/tgbatest/emptchk.cc,
src/tgbatest/ltl2tgba.cc, src/tgbatest/ltlprod.cc,
src/tgbatest/randtgba.cc, src/tgbatest/taatgba.cc, src/twa/twa.cc,
src/twa/twagraph.hh, src/twa/twasafracomplement.cc,
wrap/python/spot_impl.i: Adjust.

Automatic mass renaming.

* src/graphtest/tgbagraph.cc, src/tgba/acc.cc, src/tgba/acc.hh,
src/tgba/bdddict.cc, src/tgba/bdddict.hh, src/tgba/bddprint.cc,
src/tgba/bddprint.hh, src/tgba/formula2bdd.cc,
src/tgba/formula2bdd.hh, src/tgba/fwd.hh, src/tgba/Makefile.am,
src/tgba/taatgba.cc, src/tgba/taatgba.hh, src/tgba/tgba.cc,
src/tgba/tgbagraph.cc, src/tgba/tgbagraph.hh, src/tgba/tgba.hh,
src/tgba/tgbamask.cc, src/tgba/tgbamask.hh, src/tgba/tgbaproduct.cc,
src/tgba/tgbaproduct.hh, src/tgba/tgbaproxy.cc, src/tgba/tgbaproxy.hh,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbasafracomplement.hh,
src/tgba/.cvsignore: Rename as...
* src/graphtest/twagraph.cc, src/twa/acc.cc, src/twa/acc.hh,
src/twa/bdddict.cc, src/twa/bdddict.hh, src/twa/bddprint.cc,
src/twa/bddprint.hh, src/twa/formula2bdd.cc, src/twa/formula2bdd.hh,
src/twa/fwd.hh, src/twa/Makefile.am, src/twa/taatgba.cc,
src/twa/taatgba.hh, src/twa/twa.cc, src/twa/twagraph.cc,
src/twa/twagraph.hh, src/twa/twa.hh, src/twa/twamask.cc,
src/twa/twamask.hh, src/twa/twaproduct.cc, src/twa/twaproduct.hh,
src/twa/twaproxy.cc, src/twa/twaproxy.hh,
src/twa/twasafracomplement.cc, src/twa/twasafracomplement.hh,
src/twa/.cvsignore: ... these.
* README, bench/stutter/stutter_invariance_randomgraph.cc,
configure.ac, iface/ltsmin/modelcheck.cc, src/Makefile.am,
src/bin/common_aoutput.cc, src/bin/common_conv.hh,
src/bin/common_trans.hh, src/bin/dstar2tgba.cc, src/bin/ltl2tgta.cc,
src/bin/randaut.cc, src/dstarparse/dra2ba.cc,
src/dstarparse/public.hh, src/graphtest/Makefile.am,
src/graphtest/ngraph.cc, src/hoaparse/hoaparse.yy,
src/hoaparse/public.hh, src/kripke/fairkripke.hh,
src/kripke/kripkeexplicit.cc, src/kripke/kripkeprint.cc,
src/kripkeparse/kripkeparse.yy, src/ltlvisit/apcollect.cc,
src/ltlvisit/apcollect.hh, src/ltlvisit/exclusive.hh,
src/ltlvisit/simplify.cc, src/ltlvisit/simplify.hh,
src/priv/accmap.hh, src/ta/ta.hh, src/ta/taexplicit.cc,
src/ta/taexplicit.hh, src/ta/tgta.hh, src/ta/tgtaexplicit.cc,
src/ta/tgtaexplicit.hh, src/ta/tgtaproduct.hh, src/taalgos/dotty.cc,
src/taalgos/emptinessta.cc, src/taalgos/minimize.cc,
src/taalgos/tgba2ta.cc, src/taalgos/tgba2ta.hh,
src/tgbaalgos/are_isomorphic.cc, src/tgbaalgos/are_isomorphic.hh,
src/tgbaalgos/bfssteps.cc, src/tgbaalgos/canonicalize.cc,
src/tgbaalgos/canonicalize.hh, src/tgbaalgos/cleanacc.hh,
src/tgbaalgos/complete.hh, src/tgbaalgos/compsusp.cc,
src/tgbaalgos/compsusp.hh, src/tgbaalgos/degen.cc,
src/tgbaalgos/degen.hh, src/tgbaalgos/dotty.cc,
src/tgbaalgos/dotty.hh, src/tgbaalgos/dtbasat.cc,
src/tgbaalgos/dtbasat.hh, src/tgbaalgos/dtgbacomp.hh,
src/tgbaalgos/dtgbasat.cc, src/tgbaalgos/dtgbasat.hh,
src/tgbaalgos/dupexp.cc, src/tgbaalgos/dupexp.hh,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/emptiness.hh,
src/tgbaalgos/gtec/sccstack.hh, src/tgbaalgos/gtec/status.hh,
src/tgbaalgos/gv04.cc, src/tgbaalgos/gv04.hh, src/tgbaalgos/hoa.cc,
src/tgbaalgos/hoa.hh, src/tgbaalgos/isdet.hh, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/lbtt.hh, src/tgbaalgos/ltl2taa.hh,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/ltl2tgba_fm.hh,
src/tgbaalgos/magic.cc, src/tgbaalgos/magic.hh, src/tgbaalgos/mask.hh,
src/tgbaalgos/minimize.hh, src/tgbaalgos/ndfs_result.hxx,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/neverclaim.hh,
src/tgbaalgos/postproc.hh, src/tgbaalgos/powerset.cc,
src/tgbaalgos/powerset.hh, src/tgbaalgos/product.cc,
src/tgbaalgos/product.hh, src/tgbaalgos/projrun.cc,
src/tgbaalgos/projrun.hh, src/tgbaalgos/randomgraph.cc,
src/tgbaalgos/randomgraph.hh, src/tgbaalgos/randomize.hh,
src/tgbaalgos/reachiter.hh, src/tgbaalgos/reducerun.cc,
src/tgbaalgos/reducerun.hh, src/tgbaalgos/relabel.hh,
src/tgbaalgos/remfin.hh, src/tgbaalgos/remprop.hh,
src/tgbaalgos/replayrun.cc, src/tgbaalgos/replayrun.hh,
src/tgbaalgos/sbacc.hh, src/tgbaalgos/scc.cc, src/tgbaalgos/scc.hh,
src/tgbaalgos/sccfilter.hh, src/tgbaalgos/sccinfo.cc,
src/tgbaalgos/sccinfo.hh, src/tgbaalgos/se05.cc,
src/tgbaalgos/se05.hh, src/tgbaalgos/simulation.cc,
src/tgbaalgos/simulation.hh, src/tgbaalgos/stats.cc,
src/tgbaalgos/stats.hh, src/tgbaalgos/stripacc.hh,
src/tgbaalgos/stutter.cc, src/tgbaalgos/stutter.hh,
src/tgbaalgos/tau03.cc, src/tgbaalgos/tau03.hh,
src/tgbaalgos/tau03opt.cc, src/tgbaalgos/tau03opt.hh,
src/tgbaalgos/totgba.cc, src/tgbaalgos/totgba.hh,
src/tgbaalgos/weight.hh, src/tgbaalgos/word.cc, src/tgbatest/acc.cc,
src/tgbatest/complementation.cc, src/tgbatest/emptchk.cc,
src/tgbatest/ltl2tgba.cc, src/tgbatest/taatgba.cc,
wrap/python/spot_impl.i: Adjust.

Automatic mass renaming.

* iface/ltsmin/modelcheck.cc, src/dstarparse/dra2ba.cc,
src/dstarparse/nra2nba.cc, src/ltlvisit/apcollect.cc,
src/ltlvisit/apcollect.hh, src/ta/taexplicit.cc, src/ta/taexplicit.hh,
src/ta/tgtaexplicit.cc, src/ta/tgtaexplicit.hh, src/ta/tgtaproduct.hh,
src/taalgos/tgba2ta.cc, src/taalgos/tgba2ta.hh, src/tgba/fwd.hh,
src/tgba/tgba.cc, src/tgba/tgba.hh, src/tgba/tgbagraph.hh,
src/tgba/tgbamask.cc, src/tgba/tgbamask.hh, src/tgba/tgbaproduct.cc,
src/tgba/tgbaproduct.hh, src/tgba/tgbaproxy.cc, src/tgba/tgbaproxy.hh,
src/tgbaalgos/bfssteps.cc, src/tgbaalgos/bfssteps.hh,
src/tgbaalgos/complete.cc, src/tgbaalgos/complete.hh,
src/tgbaalgos/compsusp.cc, src/tgbaalgos/dotty.cc,
src/tgbaalgos/dotty.hh, src/tgbaalgos/dtgbasat.cc,
src/tgbaalgos/dupexp.cc, src/tgbaalgos/dupexp.hh,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/emptiness.hh,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gtec/gtec.hh,
src/tgbaalgos/gtec/status.cc, src/tgbaalgos/gtec/status.hh,
src/tgbaalgos/gv04.cc, src/tgbaalgos/gv04.hh, src/tgbaalgos/hoa.cc,
src/tgbaalgos/hoa.hh, src/tgbaalgos/lbtt.cc, src/tgbaalgos/lbtt.hh,
src/tgbaalgos/magic.cc, src/tgbaalgos/magic.hh,
src/tgbaalgos/minimize.cc, src/tgbaalgos/ndfs_result.hxx,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/neverclaim.hh,
src/tgbaalgos/projrun.cc, src/tgbaalgos/projrun.hh,
src/tgbaalgos/reachiter.cc, src/tgbaalgos/reachiter.hh,
src/tgbaalgos/reducerun.cc, src/tgbaalgos/reducerun.hh,
src/tgbaalgos/replayrun.cc, src/tgbaalgos/replayrun.hh,
src/tgbaalgos/scc.cc, src/tgbaalgos/scc.hh, src/tgbaalgos/se05.cc,
src/tgbaalgos/se05.hh, src/tgbaalgos/stats.cc, src/tgbaalgos/stats.hh,
src/tgbaalgos/stutter.cc, src/tgbaalgos/tau03.cc,
src/tgbaalgos/tau03.hh, src/tgbaalgos/tau03opt.cc,
src/tgbaalgos/tau03opt.hh, src/tgbatest/checkta.cc,
src/tgbatest/complementation.cc, src/tgbatest/emptchk.cc,
src/tgbatest/ltl2tgba.cc, wrap/python/spot_impl.i: Rename tgba_ptr as
twa_ptr.

Automatic mass renaming.

* src/dstarparse/dra2ba.cc, src/dstarparse/nra2nba.cc,
src/kripke/fairkripke.hh, src/kripke/kripke.hh,
src/kripke/kripkeprint.cc, src/ta/ta.hh, src/ta/taproduct.hh,
src/ta/tgta.hh, src/ta/tgtaexplicit.cc, src/ta/tgtaexplicit.hh,
src/ta/tgtaproduct.cc, src/ta/tgtaproduct.hh,
src/taalgos/emptinessta.cc, src/taalgos/reachiter.hh,
src/taalgos/tgba2ta.cc, src/tgba/taatgba.cc, src/tgba/taatgba.hh,
src/tgba/tgba.cc, src/tgba/tgba.hh, src/tgba/tgbagraph.hh,
src/tgba/tgbamask.cc, src/tgba/tgbaproduct.cc, src/tgba/tgbaproduct.hh,
src/tgba/tgbaproxy.cc, src/tgba/tgbaproxy.hh,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbasafracomplement.hh,
src/tgbaalgos/bfssteps.hh, src/tgbaalgos/compsusp.cc,
src/tgbaalgos/dupexp.cc, src/tgbaalgos/gtec/gtec.cc,
src/tgbaalgos/gtec/gtec.hh, src/tgbaalgos/gv04.cc,
src/tgbaalgos/lbtt.cc, src/tgbaalgos/magic.cc,
src/tgbaalgos/ndfs_result.hxx, src/tgbaalgos/reachiter.cc,
src/tgbaalgos/reachiter.hh, src/tgbaalgos/replayrun.cc,
src/tgbaalgos/scc.cc, src/tgbaalgos/scc.hh, src/tgbaalgos/se05.cc,
src/tgbaalgos/stats.cc, src/tgbaalgos/stutter.cc,
src/tgbaalgos/tau03.cc, src/tgbaalgos/tau03opt.cc: Rename
tgba_succ_iterator as twa_succ_iterator.

Automatic mass renaming.

* src/bin/autfilt.cc, src/bin/common_aoutput.cc,
src/bin/common_aoutput.hh, src/bin/common_conv.cc,
src/bin/common_conv.hh, src/bin/common_output.hh, src/bin/dstar2tgba.cc,
src/bin/ltlcross.cc, src/bin/ltldo.cc, src/bin/randaut.cc,
src/dstarparse/dra2ba.cc, src/dstarparse/dstar2tgba.cc,
src/dstarparse/dstarparse.yy, src/dstarparse/nra2nba.cc,
src/dstarparse/nsa2tgba.cc, src/dstarparse/public.hh,
src/graphtest/tgbagraph.cc, src/hoaparse/hoaparse.yy,
src/hoaparse/public.hh, src/ltlvisit/contain.hh,
src/ltlvisit/exclusive.cc, src/ltlvisit/exclusive.hh,
src/priv/accmap.hh, src/taalgos/minimize.cc, src/tgba/fwd.hh,
src/tgba/tgba.cc, src/tgba/tgbagraph.cc, src/tgba/tgbagraph.hh,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbasafracomplement.hh,
src/tgbaalgos/are_isomorphic.cc, src/tgbaalgos/are_isomorphic.hh,
src/tgbaalgos/canonicalize.cc, src/tgbaalgos/canonicalize.hh,
src/tgbaalgos/cleanacc.cc, src/tgbaalgos/cleanacc.hh,
src/tgbaalgos/complete.cc, src/tgbaalgos/complete.hh,
src/tgbaalgos/compsusp.cc, src/tgbaalgos/compsusp.hh,
src/tgbaalgos/cycles.hh, src/tgbaalgos/degen.cc, src/tgbaalgos/degen.hh,
src/tgbaalgos/dotty.cc, src/tgbaalgos/dtbasat.cc,
src/tgbaalgos/dtbasat.hh, src/tgbaalgos/dtgbacomp.cc,
src/tgbaalgos/dtgbacomp.hh, src/tgbaalgos/dtgbasat.cc,
src/tgbaalgos/dtgbasat.hh, src/tgbaalgos/dupexp.cc,
src/tgbaalgos/dupexp.hh, src/tgbaalgos/emptiness.cc,
src/tgbaalgos/emptiness.hh, src/tgbaalgos/hoa.cc,
src/tgbaalgos/isdet.cc, src/tgbaalgos/isdet.hh, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/ltl2tgba_fm.hh,
src/tgbaalgos/mask.cc, src/tgbaalgos/mask.hh, src/tgbaalgos/minimize.cc,
src/tgbaalgos/minimize.hh, src/tgbaalgos/neverclaim.cc,
src/tgbaalgos/postproc.cc, src/tgbaalgos/postproc.hh,
src/tgbaalgos/powerset.cc, src/tgbaalgos/powerset.hh,
src/tgbaalgos/product.cc, src/tgbaalgos/product.hh,
src/tgbaalgos/randomgraph.cc, src/tgbaalgos/randomgraph.hh,
src/tgbaalgos/randomize.cc, src/tgbaalgos/randomize.hh,
src/tgbaalgos/relabel.cc, src/tgbaalgos/relabel.hh,
src/tgbaalgos/remfin.cc, src/tgbaalgos/remfin.hh,
src/tgbaalgos/remprop.cc, src/tgbaalgos/remprop.hh,
src/tgbaalgos/safety.cc, src/tgbaalgos/safety.hh,
src/tgbaalgos/sbacc.cc, src/tgbaalgos/sbacc.hh,
src/tgbaalgos/sccfilter.cc, src/tgbaalgos/sccfilter.hh,
src/tgbaalgos/sccinfo.cc, src/tgbaalgos/sccinfo.hh,
src/tgbaalgos/simulation.cc, src/tgbaalgos/simulation.hh,
src/tgbaalgos/stats.cc, src/tgbaalgos/stats.hh,
src/tgbaalgos/stripacc.cc, src/tgbaalgos/stripacc.hh,
src/tgbaalgos/stutter.cc, src/tgbaalgos/stutter.hh,
src/tgbaalgos/totgba.cc, src/tgbaalgos/totgba.hh,
src/tgbaalgos/translate.cc, src/tgbaalgos/translate.hh,
src/tgbatest/checkpsl.cc, src/tgbatest/complementation.cc,
src/tgbatest/emptchk.cc, src/tgbatest/ltl2tgba.cc,
src/tgbatest/randtgba.cc, wrap/python/spot_impl.i,
wrap/python/tests/automata-io.ipynb, wrap/python/tests/automata.ipynb,
wrap/python/tests/piperead.ipynb, wrap/python/tests/testingaut.ipynb:
Rename tgba_digraph as twa_graph.

Now that we support any type of omega-accetpance, not just "Generalized
Büchi", it is time to move away from GB and replace it by "ω", written
just w in ASCII.

This just change the name of the tgba class.  This part has to be done
by hand because the word "tgba" occurs in many contexts and a mass
replacement would be wrong.

This will be followed by some automatic renaming of all the derived
types and more.

* src/bin/autfilt.cc, src/bin/randaut.cc, src/kripke/fairkripke.hh,
src/ta/tgta.cc, src/ta/tgta.hh, src/tgba/fwd.hh, src/tgba/taatgba.cc,
src/tgba/taatgba.hh, src/tgba/tgba.cc, src/tgba/tgba.hh,
src/tgba/tgbagraph.hh, src/tgba/tgbaproduct.cc, src/tgba/tgbaproduct.hh,
src/tgba/tgbaproxy.cc, src/tgba/tgbaproxy.hh,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbasafracomplement.hh,
src/tgbaalgos/are_isomorphic.cc, src/tgbaalgos/cleanacc.cc,
src/tgbaalgos/dotty.cc, src/tgbaalgos/dupexp.cc,
src/tgbaalgos/dupexp.hh, src/tgbaalgos/hoa.cc,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/simulation.cc,
src/tgbaalgos/stutter.cc, src/tgbatest/checkpsl.cc,
src/tgbatest/emptchk.cc, src/tgbatest/ltl2tgba.cc, wrap/python/spot.py,
wrap/python/spot_impl.i: Rename the tgba class into twa.

* src/tgbaalgos/stutter.cc: Add a new variant of Etessami's check,
closer to his original paper in IPL.
* src/ltltest/stutter.test: Add more tests.
* bench/stutter/user.sh: Include this new variant in the benchmark.

if a transition with the same label already exist, reuse it

* src/tgbaalgos/stutter.cc: Here.
* src/tgbatest/stutter.test: Add a test case.

Fixes #64.

* src/tgba/tgba.hh: Here.
* src/tgbaalgos/complete.cc, src/tgbaalgos/degen.cc,
src/tgbaalgos/dtgbacomp.cc, src/tgbaalgos/mask.cc,
src/tgbaalgos/minimize.cc, src/tgbaalgos/remfin.cc,
src/tgbaalgos/sccfilter.cc, src/tgbaalgos/simulation.cc,
src/tgbaalgos/stutter.cc: Adjust.

... into copy_acceptance_of().  For #65.

* src/tgba/tgbagraph.hh, src/tgbaalgos/dupexp.cc,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/mask.cc,
src/tgbaalgos/powerset.cc, src/tgbaalgos/sbacc.cc,
src/tgbaalgos/simulation.cc, src/tgbaalgos/stutter.cc: Here.

... and show it in the HOA output.  Fixes #60.

* src/tgba/tgba.hh: Add is_stutter_invariant().
* src/tgbaalgos/hoa.cc: Print stutter-invariant
and inherently-weak.
* src/tgbaalgos/ltl2tgba_fm.cc: Set both.
* src/tgbaalgos/are_isomorphic.cc, src/tgbaalgos/complete.cc,
src/tgbaalgos/degen.cc, src/tgbaalgos/dtgbacomp.cc,
src/tgbaalgos/mask.cc, src/tgbaalgos/minimize.cc,
src/tgbaalgos/remfin.cc, src/tgbaalgos/sccfilter.cc,
src/tgbaalgos/simulation.cc, src/tgbaalgos/stutter.cc,
src/tgbatest/hoaparse.test, src/tgbatest/ltldo.test,
src/tgbatest/monitor.test, src/tgbatest/randomize.test,
src/tgbatest/remfin.test, src/tgbatest/sbacc.test: Adjust.

* src/tgba/acc.hh: Add creation and printing of generic acceptance
code.
* src/tgba/acc.cc: New file.
* src/tgba/Makefile.am: Add it.
* src/tgbatest/acc.cc: More tests.
* src/tgbatest/acc.test: Update.
* src/tgba/tgba.hh (set_acceptance, get_acceptance): New methods.
* src/tgba/tgbagraph.hh: Store acceptance code.
* src/hoaparse/hoaparse.yy: Read any acceptance.
* src/dstarparse/nsa2tgba.cc, src/ta/taexplicit.cc,
src/tgba/tgbaproduct.cc, src/tgba/tgbasafracomplement.cc,
src/tgbaalgos/degen.cc, src/tgbaalgos/hoa.cc,
src/tgbaalgos/ltl2taa.cc, src/tgbaalgos/ltl2tgba_fm.cc,
src/tgbaalgos/product.cc, src/tgbaalgos/stutter.cc,
src/tgbatest/hoaparse.test: Adjust.

* src/tgbaalgos/stutter.cc (sl2): Detect selfloops, and merge
intermediate states when possible.

Report from Akim Demaille.

* src/ltlvisit/snf.cc, src/ta/taexplicit.cc, src/taalgos/tgba2ta.cc,
src/tgbaalgos/dupexp.cc, src/tgbaalgos/stutter.cc: Here.

and adjust it to detect siPSL formulas, as in the paper of Dax et
al. (ATVA'09).  For issue #51.

* src/ltlast/atomic_prop.cc, src/ltlast/binop.cc,
src/ltlast/bunop.cc, src/ltlast/constant.cc, src/ltlast/formula.cc,
src/ltlast/formula.hh, src/ltlast/multop.cc, src/ltlast/unop.cc: Rename
the property, and adjust its computation on siSERE.
* src/ltlvisit/remove_x.cc, src/ltlvisit/simplify.cc,
src/tgbaalgos/stutter.cc: Adjust to new names.
* src/bin/ltlfilt.cc: Add option --syntactic-sutter-invariant.
* src/ltltest/kind.test: Update tests and add some new.

* src/sanity/style.test: Check for it.
* src/dstarparse/nra2nba.cc, src/dstarparse/nsa2tgba.cc,
src/tgbaalgos/randomize.cc, src/tgbaalgos/stutter.cc: Fix all those.

* src/tgba/tgbasl.cc, src/tgba/tgbasl.hh, src/tgbaalgos/closure.cc,
src/tgbaalgos/closure.hh, src/tgbaalgos/stutter_invariance.cc,
src/tgbaalgos/stutter_invariance.hh, src/tgbaalgos/stutterize.cc,
src/tgbaalgos/stutterize.hh: Delete these files, and merge their
contents into...
* src/tgbaalgos/stutter.cc, src/tgbaalgos/stutter.hh: ... these two.
* src/tgba/Makefile.am, src/tgbaalgos/Makefile.am: Adjust.
* wrap/python/spot.i: Adjust.