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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.