Fixes #354.

* spot/tl/simplify.cc: Implement the rules.
* doc/tl/tl.tex, NEWS: Document them.
* tests/core/reduccmp.test: Add tests.
* tests/core/det.test, tests/core/satmin.test: Adjust.

* bin/genltl.cc, spot/gen/formulas.cc, tests/core/genltl.test: Adjust.
* NEWS: Mention it.

Fixes #352.

* bin/autfilt.cc: Add the options.
* tests/core/alternating.test: Test them.
* NEWS: Mention them.

Together with the previous patch, this Fixes #353.

Implementing this required to extend our interface two support
two-parameter patterns.

* spot/gen/formulas.cc, spot/gen/formulas.hh: Implement it.
* bin/genltl.cc: Add --sejk-f.
* bin/common_output.cc, bin/common_output.hh: Adjust to handle
"line numbers" that are not integers (e.g., "3,2"), since those
are used to display pattern parameters.
* bin/ltlfilt.cc: Adjust.
* python/spot/gen.i: Add support for two-parameters patterns.
* tests/core/genltl.test, tests/python/gen.ipynb: Augment.
* NEWS: Mention it.

These correspond to the first three blocks of table 1 in S. Sickert,
J. Esparza, S. Jaax, and J. Křetínský: Limit-Deterministic Büchi
Automata for Linear Temporal Logic.  CAV'16.  LNCS 9780.

For #353.

* spot/gen/formulas.cc, spot/gen/formulas.hh, bin/genltl.cc: Implement
the new families.
* tests/core/genltl.test: Test it.
* bin/man/genltl.x, NEWS: Document it.

When dealternating the VWAA for GFa, our result had two states that
could not be fused by simulation because of unmatched acceptance mark.
With this change, the result can be simplified.

* spot/twaalgos/alternation.cc: Here.
* tests/core/alternating.test, tests/python/alternation.ipynb: Update
test case.
* NEWS: Mention it.

* spot/misc/bitset.cc, spot/misc/bitset.hh (set, clear):
Turn asserts into exceptions.
* spot/twa/acc.hh (mark_t): As a consequence, the
constructor is not noexcept anymore.
* tests/core/acc.cc, tests/python/except.py: More tests.

* spot/twaalgos/alternation.cc: Always call ensure_weak_scc().

The exception raised by << and >> when shifting mark_t by too many
bits are only enabled in SPOT_DEBUG, as those operations are quite
low-level.  However we were always testing them, and although we
wanted them to be active in Python, it was not always the case.

* spot/twa/acc.hh: introduce max_accsets() as
a static constexpr method, so we can see it in Python.
* spot/misc/bitset.hh: Fix preprocessing directive
so the check is actually enabled when compiling the Python
bindings.
* bin/autcross.cc, bin/autfilt.cc, bin/ltlcross.cc: Use max_accsets().
* tests/core/acc.cc: Comment out the shifting exception when
SPOT_DEBUG is unset.
* tests/python/except.py: Make sure the exception is always raised in
Python.

* spot/twa/acc.hh, spot/twaalgos/alternation.cc,
  spot/twaalgos/determinize.cc, spot/twaalgos/ndfs_result.hxx,
  spot/twaalgos/tau03.cc, spot/ltsmin/ltsmin.cc, tests/core/parity.cc:
  here

* spot/twaalgos/split.cc: split_2step relies less on bdd, which improves
  its performance
* tests/python/split.py: update test

* spot/twa/twagraph.hh, spot/twa/twagraph.cc: here
* NEWS: document it
* tests/core/twagraph.cc, tests/core/tgbagraph.test: test it

* spot/misc/bitset.hh: add methods set() and clear()
* spot/twa/acc.hh: deprecate comparison of mark_t with unsigned, and
  rely more on biset for efficiency

* README, doc/org/hoa.org: Here.

* NEWS, bin/autcross.cc, bin/autfilt.cc, bin/ltlcross.cc,
configure.ac, spot/parseaut/parseaut.yy, spot/twa/acc.cc,
spot/twa/acc.hh, tests/core/acc.cc, .gitlab-ci.yml: Here.

* spot/misc/bitset.hh: Here.
* spot/misc/bitset.cc: New file.
* spot/misc/Makefile.am: Add it.
* spot/twa/acc.hh: Conditionally remove the exception checks around
shift operators.
* spot/misc/common.hh (SPOT_ASSUME): New macro.

* spot/misc/common.hh (SPOT_BUILTIN_UNREACHABLE): Typo.

Fixes #348, reported by Jeroen Meijer.

* bin/autfilt.cc: If -B is used with many --product,
degeneralize intermediate products as needed.
* NEWS: Mention the change.
* tests/core/prodchain.test: New file.
* tests/Makefile.am: Add it.
* spot/twa/acc.cc, spot/twa/acc.hh: Fix reporting of
overflow.
* tests/core/acc.cc: Adjust.

Fixes #350.

* spot/twaalgos/product.cc: Implement this change.
* NEWS, spot/twaalgos/product.hh: Mention it.
* spot/twa/acc.cc, spot/twa/acc.hh (acc_cond::sat_mark): New method.
* tests/python/_product_weak.ipynb: New file.
* tests/Makefile.am: Add it.
* tests/python/automata.ipynb, tests/python/highlighting.ipynb,
tests/python/product.ipynb, tests/core/prodor.test: Adjust test cases.

* tests/core/ltlsynt.test: here

* tests/core/genltl.test: here
* spot/gen/formulas.cc: typo

* tests/core/ltlfilt.test: here

* bin/randltl.cc: here
* tests/core/rand.test: test it
* NEWS: document it

* bin/autcross.cc, bin/autfilt.cc, bin/ltlcross.cc,
  spot/parseaut/parseaut.yy: use SPOT_NB_ACC
* spot/twa/acc.hh: make implementation private

* spot/misc/bitset.hh: here
* tests/core/acc.cc: test it

This longstanding issue caused some emptiness checks options to be
ignored in the test suite, reducing coverage.

* spot/misc/optionmap.cc (set): Insert the other keys without
erasing the existing ones.

* spot/twaalgos/gtec/gtec.cc, spot/twaalgos/gtec/gtec.hh:
Here.

* bin/common_trans.cc, bin/common_trans.hh: Here.

* .gitlab-ci.yml: here

* spot/twa/acc.hh: here

* configure.ac: do not use bash-ism

* tests/core/acc.cc: here
* tests/core/acc.test: fix test invokation

* tests/core/ltlsynt.test: here

This allows to represent more than 32 acceptance marks.

* configure.ac: add an option to specify the number of marks
* spot/twa/acc.hh: implement it
* tests/python/acc_cond.ipynb, tests/core/acc.cc,
  tests/core/ltlcross3.test: update tests
* NEWS: document it
* bin/randltl.cc: fix an include

* spot/misc/bitset.hh: implement it
* spot/misc/Makefile.am: distribute it

* NEWS: document it
* spot/twaalgos/parity.cc, spot/twaalgos/parity.hh,
  tests/core/parity.cc: here