* NEWS, configure.ac: Here.

* configure.ac, doc/org/setup.org, NEWS: Bump version to Spot 2.8.

* bin/common_trans.cc: Add it.
* NEWS: Mention it.

* spot/twaalgos/product.cc: The res pointer should be
passed by reference since we reset it to nullptr when
output_aborter says "too large".
* python/spot/impl.i: Add binding for powerset.hh,
so we can use output_aborter in Python.
* tests/python/prodexpt.py: Test it.

* doc/spot.bib (baier.19.atva): New reference.
* spot/twaalgos/genem.hh: Cite it.

* bin/common_trans.cc: Here.
* NEWS: Document this.

* NEWS, doc/tl/tl.tex: Document the rules.
* spot/tl/simplify.cc: Implement them.
* tests/core/reduccmp.test: Test them.
* tests/core/det.test, tests/core/ltl2tgba2.test,
tests/python/stutter-inv.ipynb, tests/core/385.test: Adjust.

* NEWS: Mention it.
* spot/twa/acc.hh (spot::acc_cond::format): Deprecate.
(spot::acc_cond::mark_t::as_string): New function.
* spot/taalgos/dot.cc: Use mark_t::as_string().
* spot/priv/satcommon.cc, spot/priv/satcommon.hh,
spot/twaalgos/dtwasat.cc, spot/twaalgos/emptiness.cc,
tests/core/acc.cc, tests/core/acc.test: Adjust to use << directly.

* tests/python/341.py, tests/python/alarm.py, tests/python/bdddict.py,
tests/python/bddnqueen.py, tests/python/bugdet.py,
tests/python/dualize.py, tests/python/except.py, tests/python/gen.py,
tests/python/genem.py, tests/python/implies.py,
tests/python/interdep.py, tests/python/ipnbdoctest.py,
tests/python/kripke.py, tests/python/ltl2tgba.py,
tests/python/ltlf.py, tests/python/ltlparse.py,
tests/python/ltlsimple.py, tests/python/relabel.py,
tests/python/rs_like.py, tests/python/sccsplit.py,
tests/python/semidet.py, tests/python/setacc.py,
tests/python/setxor.py, tests/python/split.py,
tests/python/streett_totgba.py, tests/python/stutter.py,
tests/python/sum.py, tests/python/toparity.py, tests/python/toweak.py,
tests/python/trival.py, python/spot/__init__.py, python/spot/aux.py,
python/spot/jupyter.py: Reformat with autopep8.

fixup! * spot/tl/simplify.cc: Fix typos in tracing code.

Fixes #372.

* doc/org/tut90.org: New file.
* doc/Makefile.am, doc/org/tut.org: Add it.
* NEWS: Mention it.
* python/spot/__init__.py: Allow make_twa_graph with
default bdd_dict.

* spot/twaalgos/postproc.cc: Fix reject_bigger argument of
minimize_obligation for --low.

* spot/twaalgos/genem.hh, spot/twaalgos/genem.cc
(generic_emptiness_check_for_scc): Add a version that takes an acc.
* spot/twaalgos/isweakscc.cc (scc_has_rejecting_cycle): Use
generic_emptiness_check_for_scc.

* spot/twa/twa.cc, spot/twa/twa.hh: Here.
* NEWS: Mention the backward incompatibility.

* spot/twaalgos/simulation.cc: Code this.
* tests/core/det.test, tests/core/dra2dba.test,
tests/core/satmin.test, tests/core/sim3.test,
tests/python/decompose.ipynb, tests/python/dualize.py: Adjust test
cases.
* NEWS: Mention the optimization.

* bin/ltlsynt.cc: Here.
* tests/core/ltlsynt.test: Adjust.

Fixes #390.

* spot/twaalgos/toparity.cc: Revert the relevant part of 516e9536.
* tests/python/toparity.py: Add test case.
* NEWS: Mention the issue.

These were disabled by mistake in f6575d2e.

* tests/python/parity.py: Uncomment test cases.

* spot/twaalgos/toparity.cc: Fix pretty print.

* doc/org/ltlsynt.org: Fix example.
* bin/ltlsynt.cc: Fix --help text.

The previous patch triggered this issue again, failing
core/ltl2tgba2.test.

* spot/twaalgos/gfguarantee.cc: Separate the replaying of history from
the modification of the automaton.
* NEWS: Mention the bug.
* tests/python/twagraph-internals.ipynb, tests/python/automata.ipynb:
Adjust.

These rules come from Delag's paper, and help some cases
in issue #385.

* spot/tl/simplify.cc: Implement the simplification.
* doc/tl/tl.tex, NEWS: Document it.
* tests/core/385.test: New file.
* tests/Makefile.am: Add it.
* tests/core/reduccmp.test: More tests.
* tests/core/ltl2tgba2.test: Adjust one improved case.
* tests/python/automata.ipynb, tests/python/twagraph-internals.ipynb:
Adjust expected output, as the cnf/dnf reorder some subformulas.

* doc/tl/tl.bib: Move ...
* doc/spot.bib: ... here, and augment it with all references that
appeared verbatim in Doxygen comments.
* doc/Makefile.am, doc/tl/Makefile.am
doc/tl/tl.tex: Adjust for the move.
* doc/Doxyfile.in: Point to spot.bib.
* spot/gen/automata.hh, spot/gen/formulas.hh, spot/misc/game.hh,
spot/misc/minato.hh spot/taalgos/emptinessta.hh,
spot/taalgos/minimize.hh, spot/taalgos/tgba2ta.hh, spot/tl/formula.hh,
spot/tl/remove_x.hh, spot/tl/simplify.hh, spot/tl/snf.hh,
spot/twaalgos/cobuchi.hh, spot/twaalgos/cycles.hh,
spot/twaalgos/dualize.hh, spot/twaalgos/gtec/gtec.hh,
spot/twaalgos/gv04.hh, spot/twaalgos/ltl2taa.hh,
spot/twaalgos/ltl2tgba_fm.hh, spot/twaalgos/magic.hh,
spot/twaalgos/minimize.hh, spot/twaalgos/parity.hh,
spot/twaalgos/powerset.hh, spot/twaalgos/randomgraph.hh,
spot/twaalgos/se05.hh, spot/twaalgos/simulation.hh,
spot/twaalgos/strength.hh, spot/twaalgos/stutter.hh,
spot/twaalgos/tau03.hh, spot/twaalgos/totgba.hh,
spot/twa...

* spot/twa/acc.cc: Here.  This fixes two failures on the buildfarm.

* spot/tl/hierarchy.cc, spot/tl/hierarchy.hh: Here.
* tests/core/hierarchy.test: Test it.
* bin/man/spot-x.x: Document SPOT_PR_CHECK.
* doc/org/hierarchy.org, NEWS: Update.

* spot/twaalgos/postproc.cc, spot/twaalgos/translate.cc: Here.
* tests/core/genltl.test, tests/core/parity2.test,
tests/core/sccsimpl.test, tests/python/twagraph-internals.ipynb:
Adjust test cases.
* NEWS: Mention it.

* spot/twaalgos/parity.cc, spot/twaalgos/parity.hh: Here.
* tests/core/parity.cc: Add test case.
* tests/python/parity.ipynb, NEWS: More documentation.

Fixes #384.

* spot/twaalgos/parity.cc: Here.
* tests/core/parity2.test, tests/python/highlighting.ipynb,
tests/python/parity.py: Adjust test cases.
* tests/python/parity.ipynb: Improve the presentation.
* NEWS: Mention the change.

* bin/autcross.cc: Let complement() decide how to complement automata.
Do not apply remove_fin(), because we have a generic emptiness check
now.  Use intersecting_word() instead of product()+accepting_word() so
that the former can maybe be optimized in the future.
* tests/core/autcross2.test: Adjust test case to use TGBA instead
of monitors, as calling complement() had a side-effect of setting
the "weak" property on the input.

* bin/genaut.cc: Implement the --m-nba option.
* spot/gen/automata.hh, spot/gen/automata.cc: Add the generation code.
* NEWS, bin/man/genaut.x: Document it.
* doc/org/genaut.org: Update.
* tests/core/genaut.test, tests/core/parity2.test: Add some tests.

* NEWS, configure.ac, doc/org/setup.org: Bump version.

* tests/ltsmin/README: Here.
* THANKS: Reported by Jiraphapa Jiravaraphan.