* spot/twa/acc.cc, spot/twa/acc.hh: Here.
* spot/parseaut/parseaut.yy, spot/twa/acc.hh,
spot/twaalgos/gtec/gtec.cc, spot/twaalgos/hoa.cc,
spot/twaalgos/neverclaim.cc, spot/twaalgos/product.cc,
spot/twaalgos/remfin.cc, spot/twaalgos/strength.cc: Adjust.
* NEWS: Mention the changes.
* wrap/python/spot_impl.i: Bind acc_cond the printer.
* wrap/python/tests/acc_cond.ipynb: Add more examples.

* wrap/python/tests/decompose.ipynb: Adjust text.
* spot/twaalgos/strength.hh, spot/twaalgos/strength.cc:
Adjust to extract inherently weak SCCs instead of weak SCCs.  This gets
rids of the special handling for the "corner cases".
* spot/tests/strength.test: Adjust.
* NEWS: Mention it.

so that we can optimize it when no Fin are used

* spot/twa/acc.cc, spot/twa/acc.hh: Do it.
* spot/twaalgos/complete.cc, spot/twaalgos/strength.cc: Adjust.

* spot/twaalgos/strength.cc, spot/twaalgos/strength.hh
(is_inherently_weak_automaton): New function.
(is_type_automaton): Adjust to implement the above and
set prop_inherently_weak().
* spot/twaalgos/isweakscc.cc, spot/twaalgos/isweakscc.hh:
Rewrite is_inherently_weak_scc() to not enumerate cycles.
* spot/bin/autfilt.cc: Add a --is-inherently-weak option.
* spot/tests/readsave.test: More tests.
* spot/tests/strength.test: Adjust expected output.
* doc/org/hoa.org: Adjust documentation of --check.
* NEWS: Mention those changes.

* NEWS: Mention the change.
* src/: Rename as ...
* spot/: ... this, adjust all headers to include <spot/...> instead of
"...", and adjust all Makefile.am to search headers from the top-level
directory.
* HACKING: Add conventions about #include.
* spot/sanity/style.test: Add a few more grep to catch cases
that do not follow these conventions.
* .gitignore, Makefile.am, README, bench/stutter/Makefile.am,
bench/stutter/stutter_invariance_formulas.cc,
bench/stutter/stutter_invariance_randomgraph.cc, configure.ac,
debian/rules, doc/Doxyfile.in, doc/Makefile.am,
doc/org/.dir-locals.el.in, doc/org/g++wrap.in, doc/org/init.el.in,
doc/org/tut01.org, doc/org/tut02.org, doc/org/tut03.org,
doc/org/tut10.org, doc/org/tut20.org, doc/org/tut21.org,
doc/org/tut22.org, doc/org/tut30.org, iface/ltsmin/Makefile.am,
iface/ltsmin/kripke.test, iface/ltsmin/ltsmin.cc,
iface/ltsmin/ltsmin.hh, iface/ltsmin/modelcheck.cc,
wrap/python/Makefile.am, wrap/python/ajax/spotcgi.in,
wrap/python/spot_impl.i, wrap/python/tests/ltl2tgba.py,
wrap/python/tests/randgen.py, wrap/python/tests/run.in: Adjust.

* wrap/python/tests/decompose.ipynb: New file.
* wrap/python/tests/Makefile.am: Add it.
* src/twaalgos/strength.cc: Fix corner cases.
* src/tests/strength.test: Adjust corner case.
* NEWS, doc/org/tut.org: Mention the notebook.

* src/twaalgos/strength.cc, src/twaalgos/strength.hh
(decompose_stregth): New function.
* src/bin/autfilt.cc: Add a --decompose-strength option.
* src/bin/man/autfilt.x: Add bibliography.
* src/tests/strength.test: Test it.
* NEWS: Mention it.

* src/twaalgos/strength.cc, src/twaalgos/strength.hh (check_strength):
New function.
* src/bin/common_aoutput.cc: Add --check=strength.
* src/tests/strength.test: New file.
* src/tests/Makefile.am: Add it.
* doc/org/hoa.org, NEWS: Document it.

Fixes #47.

* src/twaalgos/strength.cc, src/twaalgos/strength.hh
(is_weak_automaton): New function.
(is_terminal_automaton): Generalize slightly.
* src/bin/autfilt.cc: Add options --is-terminal and --is-weak.
* src/tests/readsave.test: Add a test.
* NEWS: Update.

* src/twaalgos/safety.cc, src/twaalgos/safety.hh: Rename as ...
* src/twaalgos/strength.cc, src/twaalgos/strength.hh: ... these.
* src/bin/ltlfilt.cc, src/tests/ikwiad.cc, src/twaalgos/Makefile.am,
src/twaalgos/compsusp.cc, src/twaalgos/minimize.cc,
wrap/python/spot_impl.i: Adjust.

* src/twaalgos/safety.hh, src/twaalgos/safety.cc: Here.
* src/bin/ltlfilt.cc, src/tests/ikwiad.cc, src/twaalgos/minimize.cc,
wrap/python/ajax/spotcgi.in: Adjust.
* NEWS: Mention the change.

* src/twa/twa.hh: Store the terminal property.
* src/twaalgos/hoa.cc, src/parseaut/parseaut.yy: Add I/O for "terminal".
* src/twaalgos/ltl2tgba_fm.cc, src/twaalgos/minimize.cc: Set terminal
as apropriate.
* src/twaalgos/safety.cc: Use it.
* doc/org/tut21.org, doc/org/hoa.org, NEWS: Document it.
* src/tests/complement.test, src/tests/monitor.test,
wrap/python/tests/automata-io.ipynb: Adjust.

False/True are problematic in Python, and I don't like that the
enum is op::False but the constructor formula::ff().  So let's
just use ff and tt everywhere, and also eword instead of EmptyWord.

* src/ltlast/formula.hh (False, True, EmptyWord, AP, is_false, is_true):
Rename to...
(ff, tt, eword, ap, is_ff, is_tt): ... these.
* iface/ltsmin/ltsmin.cc, src/ltlast/formula.cc,
src/ltlvisit/apcollect.cc, src/ltlvisit/dot.cc, src/ltlvisit/mark.cc,
src/ltlvisit/mutation.cc, src/ltlvisit/print.cc,
src/ltlvisit/relabel.cc, src/ltlvisit/simpfg.cc,
src/ltlvisit/simplify.cc, src/ltlvisit/snf.cc, src/ltlvisit/unabbrev.cc,
src/twa/acc.cc, src/twa/acc.hh, src/twa/formula2bdd.cc,
src/twaalgos/gtec/gtec.cc, src/twaalgos/hoa.cc, src/twaalgos/ltl2taa.cc,
src/twaalgos/ltl2tgba_fm.cc, src/twaalgos/neverclaim.cc,
src/twaalgos/product.cc, src/twaalgos/remfin.cc, src/twaalgos/safety.cc,
src/tests/parseerr.test, src/tests/utf8.test, wrap/python/spot.py:
Adjust.

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/twaalgos/minimize.cc, src/twaalgos/safety.cc,
src/twaalgos/safety.hh: Adjust.
* src/tests/wdba2.test: More tests.

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/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.

Because scc_info does not perform a full emptiness check, it is not
always able to tell whether an SCC is accepting if the acceptance
condition use Fin primitives.  This introduce is_rejecting_scc() in
addition to to is_accepting_scc().  Only one of them may be true, but
they can both be false if scc_info has no idea whether the SCC is
accepting.

* src/tgbaalgos/sccinfo.cc, src/tgbaalgos/sccinfo.hh: Implement
is_rejecting_scc().
* src/bin/ltlcross.cc, src/tgba/acc.cc, src/tgba/acc.hh,
src/tgbaalgos/dtgbacomp.cc, src/tgbaalgos/isweakscc.cc,
src/tgbaalgos/remfin.cc, src/tgbaalgos/safety.cc,
src/tgbaalgos/sccfilter.cc: Use it.
* src/tgbaalgos/dotty.cc: Use is_rejecting_scc() and is_accepting_scc()
to color SCCs.
* doc/org/oaut.org: Document the colors used.
* src/tgbatest/neverclaimread.test, src/tgbatest/readsave.test: Adjust
tests.
* src/tgbatest/sccdot.test: New test case.
* src/tgbatest/Makefile.am: Add it.

* src/tgba/tgbagraph.cc (merge_transitions): Disable acceptance
merging if Fin acceptance is used.
* src/tgbaalgos/degen.cc, src/tgbaalgos/dtbasat.cc,
src/tgbaalgos/dtgbasat.cc, src/tgbaalgos/isweakscc.cc,
src/tgbaalgos/lbtt.cc, src/tgbaalgos/minimize.cc,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/safety.cc,
src/tgbaalgos/sccfilter.cc, src/tgbaalgos/simulation.cc: Throw an
exception if an unsupported type of acceptance is received.

* src/tgbaalgos/sccinfo.cc, src/tgbaalgos/sccinfo.hh: add
scc_info::begin() and scc_info::end() methods to iterate over the
node_ vector.   Tidy the scc_node structure that that its member
are accessed via methods.
* src/tgbaalgos/safety.cc, src/bin/ltlcross.cc: Simplify using
this interface.

This fixes #6.

* src/graph/graph.hh: Rename the old transitions() as
transition_vector(), and implement a new transitions() that iterates
only on non-dead transitions.
* src/tgba/tgbagraph.hh, src/tgba/tgbagraph.cc, src/graph/ngraph.hh:
Adjust wrappers.
* src/hoaparse/hoaparse.yy, src/tgbaalgos/complete.cc,
src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbasat.cc,
src/tgbaalgos/randomize.cc, src/tgbaalgos/safety.cc: Adjust calls.

This involves reimplementing some algorithms using tgba_digraph, and
implementing an explicit product that takes two tgba_digraphs and
produces a tgba_digraph.

* src/tgbaalgos/product.cc, src/tgbaalgos/product.hh: New files.
* src/tgbaalgos/Makefile.am: Adjust.
* src/bin/ltlcross.cc, src/tgba/tgba.cc, src/tgba/tgba.hh,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbasafracomplement.hh,
src/tgbaalgos/cycles.cc, src/tgbaalgos/cycles.hh,
src/tgbaalgos/degen.cc, src/tgbaalgos/degen.hh,
src/tgbaalgos/isweakscc.cc, src/tgbaalgos/isweakscc.hh,
src/tgbaalgos/minimize.cc, src/tgbaalgos/minimize.hh,
src/tgbaalgos/powerset.cc, src/tgbaalgos/powerset.hh,
src/tgbaalgos/safety.cc, src/tgbaalgos/safety.hh,
src/tgbaalgos/sccinfo.cc, src/tgbaalgos/sccinfo.hh,
src/tgbatest/complementation.cc, src/tgbatest/emptchk.cc,
src/tgbatest/ltl2ta.test, src/tgbatest/ltl2tgba.cc,
src/tgbatest/randtgba.cc: Update to use scc_info and/or tgba_digraph.

This is a huge patch, that took over a month to complete.  The bit sets
are currently restricted to what 'unsigned can store', but it should be
easy to extend it to 'uint64_t' should we need it.

* NEWS: Update.
* src/tgba/acc.hh: New file.
* src/tgbatest/acc.cc, src/tgbatest/acc.test: Test it.
* src/tgba/tgbakvcomplement.cc, src/tgba/tgbakvcomplement.hh,
src/tgba/tgbasgba.cc, src/tgba/tgbasgba.hh: Delete.  The KV
complementation is too slow to be used in practice, and I somehow broke
it during the conversion to bitsets.  The tgba->sgba conversion was only
used for the KV complementation, and should be better redone on
tgba_digraph_ptr should it be needed again.
* src/bin/ltlcross.cc, src/dstarparse/dra2ba.cc,
src/dstarparse/nsa2tgba.cc, src/graphtest/tgbagraph.cc,
src/graphtest/tgbagraph.test, 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/misc/hash.hh, src/neverparse/neverclaimparse.yy, src/priv/accmap.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/tgta.cc,
src/ta/tgta.hh, src/ta/tgtaexplicit.cc, src/ta/tgtaexplicit.hh,
src/ta/tgtaproduct.cc, src/ta/tgtaproduct.hh, src/taalgos/dotty.cc,
src/taalgos/emptinessta.cc, src/taalgos/minimize.cc,
src/taalgos/tgba2ta.cc, src/tgba/Makefile.am, src/tgba/fwd.hh,
src/tgba/taatgba.cc, src/tgba/taatgba.hh, src/tgba/tgba.cc,
src/tgba/tgba.hh, src/tgba/tgbagraph.cc, 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/tgba/tgbasafracomplement.cc, src/tgba/tgbasafracomplement.hh,
src/tgbaalgos/bfssteps.cc, src/tgbaalgos/complete.cc,
src/tgbaalgos/compsusp.cc, src/tgbaalgos/degen.cc,
src/tgbaalgos/dotty.cc, src/tgbaalgos/dtbasat.cc,
src/tgbaalgos/dtgbacomp.cc, src/tgbaalgos/dtgbasat.cc,
src/tgbaalgos/dupexp.cc, src/tgbaalgos/emptiness.cc,
src/tgbaalgos/emptiness.hh, src/tgbaalgos/gtec/ce.cc,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gtec/gtec.hh,
src/tgbaalgos/gtec/sccstack.cc, src/tgbaalgos/gtec/sccstack.hh,
src/tgbaalgos/gv04.cc, src/tgbaalgos/hoaf.cc,
src/tgbaalgos/isweakscc.cc, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/magic.cc,
src/tgbaalgos/ndfs_result.hxx, src/tgbaalgos/neverclaim.cc,
src/tgbaalgos/postproc.cc, src/tgbaalgos/powerset.cc,
src/tgbaalgos/randomgraph.cc, src/tgbaalgos/randomgraph.hh,
src/tgbaalgos/reducerun.cc, src/tgbaalgos/replayrun.cc,
src/tgbaalgos/safety.cc, src/tgbaalgos/save.cc, src/tgbaalgos/scc.cc,
src/tgbaalgos/scc.hh, src/tgbaalgos/sccfilter.cc,
src/tgbaalgos/sccinfo.cc, src/tgbaalgos/sccinfo.hh,
src/tgbaalgos/se05.cc, src/tgbaalgos/simulation.cc,
src/tgbaalgos/simulation.hh, src/tgbaalgos/stats.cc,
src/tgbaalgos/stripacc.cc, src/tgbaalgos/tau03.cc,
src/tgbaalgos/tau03opt.cc, src/tgbaalgos/weight.cc,
src/tgbaalgos/weight.hh, src/tgbaparse/tgbaparse.yy,
src/tgbatest/Makefile.am, src/tgbatest/complementation.cc,
src/tgbatest/complementation.test, src/tgbatest/degenlskip.test,
src/tgbatest/det.test, src/tgbatest/dstar.test, src/tgbatest/emptchk.cc,
src/tgbatest/explpro2.test, src/tgbatest/explpro3.test,
src/tgbatest/explpro4.test, src/tgbatest/explprod.test,
src/tgbatest/ltl2tgba.cc, src/tgbatest/ltl2tgba.test,
src/tgbatest/maskacc.cc, src/tgbatest/maskacc.test,
src/tgbatest/neverclaimread.test, src/tgbatest/randtgba.cc,
src/tgbatest/readsave.test, src/tgbatest/sim.test,
src/tgbatest/sim2.test, src/tgbatest/spotlbtt.test,
src/tgbatest/tgbaread.test, src/tgbatest/tripprod.test,
iface/dve2/dve2.cc: Adjust or use to the new acceptance interface.

A type such as 'const tgba_digraph*' and 'tgba_digraph*' are replaced
by 'const_tgba_digraph_ptr' and 'tgba_digraph_ptr'.  Additionally 'new
tgba_digraph(...)' is replaced by 'make_tgba_digraph(...)'.

This convention is followed by all automata types. Those smart
pointers should normally be passed by const reference as input of
function to avoid the atomic increments/decrements, but I probably
missed a few, as this huge patch took me nearly 12h.

* src/kripke/fwd.hh, src/tgba/fwd.hh: New files.
* src/kripke/Makefile.am, src/tgba/Makefile.am: Adjust.
* iface/dve2/dve2.cc, iface/dve2/dve2.hh, iface/dve2/dve2check.cc,
src/bin/common_output.hh, src/bin/dstar2tgba.cc,
src/bin/ltl2tgba.cc, src/bin/ltl2tgta.cc, src/bin/ltlcross.cc,
src/bin/ltlfilt.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/kripke/fairkripke.hh, src/kripke/kripke.hh,
src/kripke/kripkeexplicit.cc, src/kripke/kripkeexplicit.hh,
src/kripke/kripkeprint.cc, src/kripke/kripkeprint.hh,
src/kripkeparse/kripkeparse.yy, src/kripkeparse/public.hh,
src/kripketest/parse_print_test.cc, src/ltlvisit/apcollect.cc,
src/ltlvisit/apcollect.hh, src/ltlvisit/contain.cc,
src/ltlvisit/contain.hh, src/neverparse/neverclaimparse.yy,
src/neverparse/public.hh, src/priv/accmap.hh,
src/priv/countstates.cc, src/priv/countstates.hh, src/saba/saba.hh,
src/saba/sabacomplementtgba.cc, src/saba/sabacomplementtgba.hh,
src/sabaalgos/sabadotty.cc, src/sabaalgos/sabadotty.hh,
src/sabaalgos/sabareachiter.cc, src/sabaalgos/sabareachiter.hh,
src/sabatest/sabacomplementtgba.cc, src/ta/ta.hh,
src/ta/taexplicit.cc, src/ta/taexplicit.hh, src/ta/taproduct.cc,
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/dotty.cc, src/taalgos/dotty.hh,
src/taalgos/emptinessta.cc, src/taalgos/emptinessta.hh,
src/taalgos/minimize.cc, src/taalgos/minimize.hh,
src/taalgos/reachiter.cc, src/taalgos/reachiter.hh,
src/taalgos/statessetbuilder.cc, src/taalgos/statessetbuilder.hh,
src/taalgos/stats.cc, src/taalgos/stats.hh, src/taalgos/tgba2ta.cc,
src/taalgos/tgba2ta.hh, src/tgba/bdddict.cc, src/tgba/bdddict.hh,
src/tgba/formula2bdd.hh, src/tgba/futurecondcol.cc,
src/tgba/futurecondcol.hh, src/tgba/taatgba.hh, src/tgba/tgba.cc,
src/tgba/tgba.hh, src/tgba/tgbagraph.hh,
src/tgba/tgbakvcomplement.cc, src/tgba/tgbakvcomplement.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/tgbascc.cc,
src/tgba/tgbascc.hh, src/tgba/tgbasgba.cc, src/tgba/tgbasgba.hh,
src/tgba/wdbacomp.cc, src/tgba/wdbacomp.hh,
src/tgbaalgos/bfssteps.cc, src/tgbaalgos/bfssteps.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/dotty.hh, src/tgbaalgos/dottydec.cc,
src/tgbaalgos/dottydec.hh, 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/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/isdet.cc,
src/tgbaalgos/isdet.hh, src/tgbaalgos/isweakscc.cc,
src/tgbaalgos/lbtt.cc, src/tgbaalgos/lbtt.hh,
src/tgbaalgos/ltl2taa.cc, src/tgbaalgos/ltl2taa.hh,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/ltl2tgba_fm.hh,
src/tgbaalgos/magic.cc, src/tgbaalgos/magic.hh,
src/tgbaalgos/minimize.cc, src/tgbaalgos/minimize.hh,
src/tgbaalgos/ndfs_result.hxx, src/tgbaalgos/neverclaim.cc,
src/tgbaalgos/neverclaim.hh, src/tgbaalgos/postproc.cc,
src/tgbaalgos/postproc.hh, src/tgbaalgos/powerset.cc,
src/tgbaalgos/powerset.hh, src/tgbaalgos/projrun.cc,
src/tgbaalgos/projrun.hh, src/tgbaalgos/randomgraph.cc,
src/tgbaalgos/randomgraph.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/rundotdec.cc,
src/tgbaalgos/rundotdec.hh, src/tgbaalgos/safety.cc,
src/tgbaalgos/safety.hh, src/tgbaalgos/save.cc,
src/tgbaalgos/save.hh, src/tgbaalgos/scc.cc, src/tgbaalgos/scc.hh,
src/tgbaalgos/sccfilter.cc, 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.cc, src/tgbaalgos/stripacc.hh,
src/tgbaalgos/tau03.cc, src/tgbaalgos/tau03.hh,
src/tgbaalgos/tau03opt.cc, src/tgbaalgos/tau03opt.hh,
src/tgbaalgos/translate.cc, src/tgbaalgos/translate.hh,
src/tgbaparse/public.hh, src/tgbaparse/tgbaparse.yy,
src/tgbatest/complementation.cc, src/tgbatest/explprod.cc,
src/tgbatest/ltl2tgba.cc, src/tgbatest/ltlprod.cc,
src/tgbatest/maskacc.cc, src/tgbatest/powerset.cc,
src/tgbatest/randtgba.cc, src/tgbatest/taatgba.cc,
src/tgbatest/tgbaread.cc, src/tgbatest/tripprod.cc,
wrap/python/ajax/spot.in, wrap/python/spot.i,
wrap/python/tests/interdep.py: Use shared pointers for automata.

* src/tgbaalgos/bfssteps.cc, src/tgbaalgos/complete.cc,
src/tgbaalgos/cycles.cc, src/tgbaalgos/dtgbacomp.cc,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gv04.cc,
src/tgbaalgos/isweakscc.cc, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/reachiter.cc,
src/tgbaalgos/replayrun.cc, src/tgbaalgos/safety.cc,
src/tgbaalgos/save.cc: Avoid calls to done().

Instead of "delete iter;" we now do "aut->release_iter(iter);" to
give the iterator back to the automaton.  The TGBA classes now
reuse a previously returned tgba_succ_iterator to answer a succ_iter()
call, therefore avoiding (1) memory allocation, as well as (2) vtable
and other constant member initialization.

* src/tgba/tgba.hh, src/tgba/tgba.cc (release_iter, iter_cache_):
Implement a release_iter() that stores the released iterator
in iter_cache_.
* src/tgba/succiter.hh (internal::succ_iterable): Move...
* src/tgba/tgba.hh (tgba::succ_iterable): ... here. And use
release_iter().

* iface/dve2/dve2.cc, src/kripke/kripke.cc, src/kripke/kripke.hh,
src/tgba/succiterconcrete.cc, src/tgba/succiterconcrete.hh,
src/tgba/taatgba.hh, src/tgba/tgbabddconcrete.cc,
src/tgba/tgbaexplicit.hh, src/tgba/tgbamask.cc, src/tgba/tgbaproduct.cc,
src/tgba/tgbaproxy.cc, src/tgba/tgbascc.cc, src/tgba/tgbatba.cc,
src/tgba/tgbaunion.cc, src/tgba/tgbaunion.hh, src/tgba/wdbacomp.cc,
src/tgbaalgos/bfssteps.cc, src/tgbaalgos/compsusp.cc,
src/tgbaalgos/cycles.cc, src/tgbaalgos/dtbasat.cc,
src/tgbaalgos/dtgbasat.cc, src/tgbaalgos/gtec/gtec.cc,
src/tgbaalgos/gv04.cc, src/tgbaalgos/isweakscc.cc,
src/tgbaalgos/lbtt.cc, src/tgbaalgos/ltl2tgba_fm.cc,
src/tgbaalgos/magic.cc, src/tgbaalgos/ndfs_result.hxx,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/reachiter.cc,
src/tgbaalgos/replayrun.cc, src/tgbaalgos/safety.cc,
src/tgbaalgos/scc.cc, src/tgbaalgos/se05.cc,
src/tgbaalgos/simulation.cc, src/tgbaalgos/tau03.cc,
src/tgbaalgos/tau03opt.cc: Use release_iter() instead of deleting
iterators, and used recycle iter_cache_ in implementations of
tgba::succ_iter().

| tgba_succ_iterator* i = aut->succ_iter(s);
| for (i->begin(); !i->done(); i->next())
|   {
|      // ...
|   }
| delete i;

becomes

| for (auto i: aut->succ(s))
|   {
|      // ...
|   }

hiding the begin()/done()/next() interface, taking care of the delete,
and allowing more optimization to come.

* src/tgba/succiter.hh, src/tgba/tgba.hh: Implement the above
new interface.
* iface/gspn/ssp.cc, src/dstarparse/nsa2tgba.cc,
src/saba/sabacomplementtgba.cc, src/tgba/tgbakvcomplement.cc,
src/tgba/tgbamask.cc, src/tgba/tgbasafracomplement.cc,
src/tgba/tgbatba.cc, src/tgbaalgos/compsusp.cc, src/tgbaalgos/cutscc.cc,
src/tgbaalgos/degen.cc, src/tgbaalgos/emptiness.cc,
src/tgbaalgos/isdet.cc, src/tgbaalgos/ltl2tgba_fm.cc,
src/tgbaalgos/minimize.cc, src/tgbaalgos/powerset.cc,
src/tgbaalgos/safety.cc, src/tgbaalgos/simulation.cc,
src/tgbaalgos/tau03.cc, src/tgbatest/explicit2.cc: Update for
loops.

* src/tgbaalgos/degen.cc (unicity_table): Move and rename as...
* src/tgba/state.hh (state_unicity_table): ... this.
* src/tgbaalgos/cutscc.cc, src/tgbaalgos/cycles.cc,
src/tgbaalgos/cycles.hh, src/tgbaalgos/minimize.cc,
src/tgbaalgos/powerset.cc, src/tgbaalgos/powerset.hh,
src/tgbaalgos/safety.cc: Use it to simplify existing code.

* bench/scc-stats/stats.cc, bench/split-product/cutscc.cc,
iface/gspn/ssp.cc, src/bin/ltlcross.cc, src/bin/ltlfilt.cc,
src/bin/randltl.cc, src/dstarparse/nsa2tgba.cc, src/ltlast/formula.hh,
src/ltlast/nfa.hh, src/ltlvisit/contain.hh, src/ltlvisit/dotty.cc,
src/ltlvisit/mark.hh, src/ltlvisit/relabel.cc, src/ltlvisit/relabel.hh,
src/ltlvisit/simplify.cc, src/ltlvisit/snf.hh, src/misc/hash.hh,
src/misc/mspool.hh, src/priv/acccompl.hh, src/priv/accconv.hh,
src/saba/explicitstateconjunction.hh, src/saba/sabastate.hh,
src/sabaalgos/sabareachiter.hh, src/sanity/style.test,
src/ta/taexplicit.cc, src/ta/taexplicit.hh, src/taalgos/emptinessta.cc,
src/taalgos/minimize.cc, src/taalgos/reachiter.hh, src/tgba/state.hh,
src/tgba/taatgba.hh, src/tgba/tgbabddconcretefactory.hh,
src/tgba/tgbaexplicit.hh, src/tgba/tgbakvcomplement.cc,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbatba.cc,
src/tgba/tgbatba.hh, src/tgbaalgos/cutscc.cc, src/tgbaalgos/cycles.hh,
src/tgbaalgos/degen.cc, src/tgbaalgos/dtbasat.cc,
src/tgbaalgos/dtgbasat.cc, src/tgbaalgos/eltl2tgba_lacim.cc,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/gtec/explscc.hh,
src/tgbaalgos/gtec/nsheap.hh, src/tgbaalgos/gv04.cc,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/magic.cc,
src/tgbaalgos/minimize.cc, src/tgbaalgos/ndfs_result.hxx,
src/tgbaalgos/powerset.hh, src/tgbaalgos/randomgraph.cc,
src/tgbaalgos/reachiter.hh, src/tgbaalgos/replayrun.cc,
src/tgbaalgos/safety.cc, src/tgbaalgos/scc.hh, src/tgbaalgos/se05.cc,
src/tgbaalgos/simulation.cc, src/tgbaalgos/tau03.cc,
src/tgbaalgos/tau03opt.cc: Adjust code.
* src/sanity/style.test: Remove check.

* NEWS: Mention this.
* COPYING: Replace by GPL v3.
* src/sanity/style.test: Check files with the wrong license,
in case we forgot to update it during a merge.
* Makefile.am, bench/Makefile.am, bench/emptchk/Makefile.am,
bench/emptchk/defs.in, bench/emptchk/ltl-human.sh,
bench/emptchk/ltl-random.sh, bench/emptchk/pml-clserv.sh,
bench/emptchk/pml-eeaean.sh, bench/emptchk/pml2tgba.pl,
bench/ltl2tgba/big, bench/ltl2tgba/defs.in, bench/ltl2tgba/known,
bench/ltl2tgba/lbtt2csv.pl, bench/ltl2tgba/ltl2baw.in,
bench/ltl2tgba/parseout.pl, bench/ltl2tgba/small,
bench/ltlclasses/Makefile.am, bench/ltlclasses/defs.in,
bench/ltlclasses/run, bench/ltlcounter/Makefile.am,
bench/ltlcounter/defs.in, bench/ltlcounter/run,
bench/scc-stats/Makefile.am, bench/scc-stats/stats.cc,
bench/split-product/Makefile.am, bench/split-product/cutscc.cc,
bench/split-product/pml2tgba.pl, bench/wdba/Makefile.am,
bench/wdba/defs.in, bench/wdba/run, configure.ac, doc/Makefile.am,
doc/dot.in, doc/tl/Makefile.am, ifac...

implement is_safety_mwdba().

Note: I swapped the name of safety and guarantee when I
implemented is_safety_automaton() on 2010-03-20.  Fortunately,
is_safety_automaton() was only used where is_guarantee_automaton()
would have been correct.

* src/tgbaalgos/safety.cc (is_guarantee_automaton): Rename as ...
(is_guarantee_automaton): ... this.
(is_safety_mwdba): New function.
* src/tgbaalgos/safety.hh: Adjust and add documentation.
* src/tgbaalgos/minimize.cc: Use is_guarantee_automaton() instead
of is_safety_automaton().
* src/tgbatests/safety.test: Rename as ...
* src/tgbatests/obligation.test: ... this, and augment the
test.
* src/tgbatest/Makefile.am: Adjust.
* src/tgbatest/ltl2tgba.cc (-O): Display whether a formula
represent a safety, guarantee, or obligation property.
* NEWS: Adjust.

Right now, destroy() just executes "delete this".  But in a later
version, we will rewrite tgba_explicit so that it does not
allocate new states (and the destroy() method for explicit state
will do nothing).

* src/tgba/state.hh (state::destroy): New method, to replace
state::~state() in the future.
(shared_state_deleter): New function.
* src/evtgba/product.cc, src/evtgbaalgos/reachiter.cc,
src/evtgbaalgos/save.cc, src/evtgbaalgos/tgba2evtgba.cc,
src/tgba/tgba.cc, src/tgba/tgbaproduct.cc, src/tgba/tgbareduc.cc,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbasgba.cc,
src/tgba/tgbatba.cc, src/tgba/tgbaunion.cc, src/tgba/wdbacomp.cc,
src/tgbaalgos/cutscc.cc, src/tgbaalgos/emptiness.cc,
src/tgbaalgos/gtec/ce.cc, src/tgbaalgos/gtec/explscc.cc,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gtec/nsheap.cc,
src/tgbaalgos/gv04.cc, src/tgbaalgos/magic.cc,
src/tgbaalgos/minimize.cc, src/tgbaalgos/ndfs_result.hxx,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/powerset.hh,
src/tgbaalgos/reachiter.cc, src/tgbaalgos/reducerun.cc,
src/tgbaalgos/reductgba_sim.cc,
src/tgbaalgos/reductgba_sim_del.cc, src/tgbaalgos/replayrun.cc,
src/tgbaalgos/safety.cc, src/tgbaalgos/save.cc,
src/tgbaalgos/scc.cc, src/tgbaalgos/se05.cc,
src/tgbaalgos/tau03.cc, src/tgbaalgos/tau03opt.cc: Adjust to call
"s->destroy()" instead of "delete s".
* src/saba/sabacomplementtgba.cc, src/tgba/tgbakvcomplement.cc:
Pass shared_state_deleter to the shared_ptr constructor, so that
it calls destroy() instead of delete.

* src/tgbaalgos/safety.hh, src/tgbaalgos/safety.cc: New
files.
* src/tgbaalgos/Makefile.am: Add them.
* src/tgbatests/ltl2tgba.cc: Add option "-O".
* src/tgbaalgos/scc.hh: Update documentation.
* src/tgbatest/Makefile.am (TESTS): Add safety.test.
* src/tgbatest/safety.test: New file.