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Fixes #214.

* m4/gccwarn.m4: Add -Wpedantic.

Fixes #215, reported by Thibaud Michaud.

Also related to GCC bug 79301.

* spot/misc/common.hh: Here.

* spot/ltsmin/ltsmin.cc: Here.

* spot/ltsmin/ltsmin.cc: Here.

* spot/priv/weight.cc, spot/priv/weight.hh,
spot/twaalgos/determinize.cc, spot/twaalgos/stats.cc: Here.

For #214, as observed by Thibaud Michaud.

* spot/twa/acc.hh: Name the anonymous struct.
* spot/twa/acc.hh, spot/twa/acc.cc, spot/parseaut/parseaut.yy,
spot/twaalgos/dtwasat.cc, spot/twaalgos/remfin.cc,
spot/twaalgos/sepsets.cc, spot/twaalgos/totgba.cc: Adjust all usages.
* NEWS: Mention the renaming.

* HACKING: fix command-line invokation of make check for Teamcity.

Fixes #210.

* doc/org/ltldo.org: Actually execute the code writing sample.ltl, and
remove the file once it is not used anymore.

Fixes #206.

* bin/ltldo.cc: Implement --smallest and --greatest.
* tests/core/ltldo2.test: Test them.
* NEWS, doc/org/ltldo.org: Document them.

* tests/Makefile.am: Remove TEST_EXTENSIONS + typos.

* spot/ltsmin/ltsmin.cc: Here.  This fixes 5a441e1b.

* spot/ltsmin/ltsmin.cc: Do not forget to register dead.
* spot/twa/twaproduct.cc: Use copy_ap_of() instead of
register_all_propositions_of() because the latter does
do update ap().

* NEWS, configure.ac: Here.

* configure.ac, doc/org/setup.org, NEWS: Bump version to 2.3.

* doc/org/index.org: Add links to the hierarchy and sat-minimization.
* doc/org/satmin.org: Show how to use glucose.

* python/spot/__init__.py (show_mp_hierarchy, mp_hierarchy_svg): New
functions.
* tests/python/formulas.ipynb: Illustrate show_mp_hierarchy.
* python/ajax/spotcgi.in: Use mp_hierarchy_svg.
* python/ajax/css/trans.css: Adjust for possible overflows.
* NEWS: Mention this new feature.

Fixes #194.

* spot/graph/graph.hh: Here.

* spot/twaalgos/dtbasat.cc, spot/twaalgos/dtwasat.cc: Here.

* tests/python/highlighting.ipynb: Add an example of
highlight_languages().

Fixes #203.

* spot/twaalgos/langmap.hh (highlight_languages): Simplify the
interface by only taking the automaton to color.
* spot/twaalgos/langmap.cc (highlight_languages): Only introduce
color for states that have a non-unique language.
* tests/core/highlightstate.test: Update and add more tests.
* tests/python/langmap.py: Keep the tests simple.
* bin/autfilt.cc: Adjust usage and help string.

* spot/misc/tmpfile.cc, spot/misc/tmpfile.hh: Remove throw specifier
to suppress a deprecation warning from g++ 7.

* NEWS: typo.
* bench/dtgbasat/config.bench: typo.
* bench/dtgbasat/gen.py: typo.
* bench/dtgbasat/stat-gen.sh: typo.
* doc/org/concepts.org: typo.

* bin/common_output.cc: Move some of the printing code...
* spot/tl/hierarchy.cc, spot/tl/hierarchy.hh: ... here, as new
  variants of mp_class...
* python/spot/impl.i: ... that we can now call from Python.
* python/ajax/spotcgi.in: Use those to simplify and extend
the code printing class membership.

Suggested by Jeroen Meijer.

* spot/libspot.pc.in, spot/ltsmin/libspotltsmin.pc.in: New file.
* spot/Makefile.am, spot/ltsmin/Makefile.am: Distribute them, and
install their derived version.
* spot/.gitignore: Ignore *.pc files.
* debian/libbddx-dev.install, debian/libspot-dev.install: Ship
those *.pc files.
* NEWS: Mention it.

* src/libbddx.pc.in: New file.
* src/Makefile.am: Generate libbddx.pc, and install it.
Distribute libbddx.pc.in.
* src/.gitignore: Ignore *.pc.

* bin/ltlcross.cc: Fix it.
* tests/core/ltlcross3.test: Test it.
* NEWS: Mention the bug.

Fixes #204.

* spot/twaalgos/dtwasat.cc (sat_minimize): Here.
* tests/core/satmin2.test: Add a test case.
* NEWS: Mention the bug.

* spot/twaalgos/alternation.cc: Fix the code to also check the
weakness of single-state SCCs.
* tests/core/alternating.test: Add a test from ltl3hoa.

Suggested by Jeroen Meijer.

* debian/rules: Enable static libraries.
* debian/libbddx-dev.install, debian/libspot-dev.install: Distribute
them.
* THANKS: Add Jeroen.
* NEWS: Mention the change.

* bin/common_trans.cc: Add shorthand for ltl3hoa.
* NEWS, doc/org/ltlcross.org, doc/org/ltldo.org: Mention it.

* bin/common_trans.cc, bin/common_trans.hh: Add the --relabel option.
* bin/ltlcross.cc, bin/ltldo.cc: Implement it.
* doc/org/ltldo.org, NEWS: Document it.
* tests/core/ltl3ba.test: Test it.

* bin/ltlcross.cc: Do it.
* bin/common_trans.cc: Adjust documentation.
* tests/core/ltl3ba.test: Test it.
* NEWS: Document it.

* doc/org/hierarchy.org, doc/org/hierarchy.tex: New files.
* doc/Makefile.am, doc/org/tools.org, NEWS: Add them.

* doc/org/ltlfilt.org: Update example.
* doc/org/ioltl.org: Explain %s briefly.

* spot/twaalgos/minimize.cc (minimize_wdba): Diminish the color of
terminal SCCs that are incomplete, as if they had a non-accepting
sink as successor.
* spot/twaalgos/strength.hh, spot/twaalgos/strength.cc
(is_terminal_automaton): Add an option to ignore trivial SCC as we did
before, since it matters for deciding membership to the guarantee
class.
(is_safety_mwdba): Rewrite as ...
(is_safety_automaton): ... generalizating to any acceptance, and
ignoring trivial SCCs.
* bin/ltlfilt.cc, python/ajax/spotcgi.in, spot/tl/hierarchy.cc,
tests/core/ikwiad.cc: Adjust usage of is_terminal_automaton and
is_safety_automaton().
* tests/core/hierarchy.test: Add a problematic formula as test-case.
* NEWS: Mention the bug.

Tools for deciding the class of a formula.

* spot/tl/hierarchy.cc, spot/tl/hierarchy.hh: New files.
* spot/tl/Makefile.am: Add them.
* bin/common_output.cc, bin/common_output.hh: Implement --format=%h.
* tests/core/hierarchy.test: More tests.
* NEWS: Update.

* spot/twaalgos/remfin.cc, spot/twaalgos/remfin.hh
(rabin_to_buchi_maybe): Make this function public.
* bin/ltlfilt.cc: Implement the two options.
* tests/core/hierarchy.test: New file.
* tests/Makefile.am: Add it.
* NEWS: Mention the new options.