* spot/twaalgos/translate.cc, spot/twaalgos/translate.hh: Build
automata with generic acceptance by doing product of automata for
smaller subformulas.
* bin/spot-x.cc: Mention ltl-split.
* NEWS: Mention the change, and show some results.
* tests/core/genltl.test, tests/python/_product_susp.ipynb,
tests/python/highlighting.ipynb: Adjust test cases.
* doc/org/ltl2tgba.org: Update.
* tests/core/gragsa.test: Add another formula to cover more
code.
This is adapted from a proposition in a paper by J. Esparza,
J. Křentínský, and S. Sickert, submitted to LICS'18. We should add
proper references to the code and documentation once that paper is
accepted.
* spot/twaalgos/gfguarantee.cc, spot/twaalgos/gfguarantee.hh:
New files.
* spot/twaalgos/Makefile.am, python/spot/impl.i: Add them.
* spot/twa/fwd.hh: Add a forward declaration of bdd_dict_ptr.
* spot/twaalgos/postproc.cc, spot/twaalgos/postproc.hh: Make it
possible to call finalize() from the translator subclass. Constify
all the do_* functions while we are there.
* spot/twaalgos/translate.cc, spot/twaalgos/translate.hh: Add
a "gf-guarantee" option to decide whether to use the new translation.
* bin/spot-x.cc: Document it.
* tests/core/dca2.test, tests/core/genltl.test,
tests/core/ltl2tgba2.test, tests/core/parity2.test,
tests/core/satmin.test, tests/python/automata.ipynb,
tests/python/sbacc.py: Adjust test cases.
* tests/python/except.py: Add a couple more tests.
This is long overdue, and we probably want to use tls-impl=1 in
ltlsynt.
* spot/twaalgos/translate.cc, spot/twaalgos/translate.hh:
Add support for tls-impl=N.
* tests/core/ltl2tgba.test: Test it.
* bin/spot-x.cc, NEWS: Document it.
Suggested by Maximilien Colange.
* spot/twaalgos/degen.cc: If the output has more SCC than the input,
detect useless SCCs and remove them.
* spot/twaalgos/postproc.cc, spot/twaalgos/postproc.hh,
spot/twaalgos/degen.hh: Add support for a degen-remscc option.
* bin/spot-x.cc, NEWS: Document it.
* tests/core/degenscc.test: New file.
* tests/Makefile.am: Add it.
* tests/core/det.test: Lower some expected size (yay!).
* spot/twaalgos/postproc.cc, spot/twaalgos/postproc.hh:
Add options det-scc, det-simul, det-stutter.
* bin/spot-x.cc: Document them.
* doc/org/ltl2tgba.org: Illustrate one of them and link
to the spot-x man page.
