This is motivated by some upcoming patch by Heňo.

* spot/twaalgos/sccinfo.hh (edges_of, inner_edges_of): New methods.
* spot/twaalgos/sccinfo.cc, spot/twaalgos/strength.cc: Use them.
* spot/twa/twagraph.hh (edge_number): Add an overload.
* python/spot/impl.i: Bind the new methods.
* tests/python/sccinfo.py: Add tests.
* NEWS: Mention the changes.

* doc/org/ltlfilt.org: A the list of transformation option.
Suggested by Yann Thierry-Mieg.

Fixes #260.  Reported by František Blahoudek.

The simplification F(f)|q = F(f|q), where q designates an event_univ
formula, was not always applied because of a couple of issue: (1) the
mospliter was ignoring event_univ unless favor_event_univ was set, (2)
when processing formulas from res_EventUniv they were not put back
into res_F or res_G to be subject to the F/G rules.

* spot/tl/simplify.cc: Improve handling of the above points.
* tests/core/reduccmp.test: Adjust and add test case.
* tests/core/ltl2tgba2.test, tests/python/atva16-fig2a.ipynb: Adjust.

Fixes #255.

* spot/twaalgos/split.cc, spot/twaalgos/split.hh,
tests/core/split.test: New files.
* spot/twaalgos/Makefile.am, tests/Makefile.am: Add them.
* bin/autfilt.cc (--split-edges): New option.
* python/spot/impl.i: Process split.hh.
* tests/python/alternating.py: Test split_edges() on
an alternating automaton.

* debian/rules (override_dh_installchangelogs): New rule.

Fixes #257.

* spot/twaalgos/degen.cc: Implement this optimization.
* tests/core/degendet.test: Add a few test cases.
* tests/core/ltl2tgba2.test: Adjust expected sizes.
* NEWS: Mention the change.

* spot/twa/twagraph.cc, spot/twa/twagraph.hh (format_state): Honor
the state-names and product-states properties.
* tests/python/highlighting.ipynb: Adjust.

* spot/twa/twagraph.cc, spot/twa/twagraph.hh: Here.  Also
make sure "original-states" survives defrag_states().
* NEWS: Mention it.
* tests/python/origstate.py: New file.
* tests/Makefile.am: Add it.

* spot/twaalgos/sum.cc: Remove useless include.

Fixes #259.

* bin/common_setup.cc: Register a cleanup_tmpfiles() via atexit.
* tests/core/ltldo.test: Add a test case.
* NEWS: Mention the bug.

We generate ChangeLog from git log now.

* ChangeLog: Rename as...
* ChangeLog.1: ... this.
* Makefile.am: Distribute the latter.

* spot/gen/libspotgen.pc.in: New file.
* spot/gen/Makefile.am: Install libspotgen.pc.
* debian/libspot-dev.install: Update.

Report from Jeroen Meijer.

* spot/Makefile.am (libspot.pc): Depends on Makefile.  Use a
temporary.  Declare in CLEANFILES instead of DISTCLEANFILES.
* spot/ltsmin/Makefile.am (libspotltsmin.pc): Likewise.

Report from Jeroen Meijer.

* src/Makefile.am (libbddx.pc): Depends on Makefile.  Use a
temporary.  Declare in CLEANFILES instead of DISTCLEANFILES.

Fixes #233, although more cleanup would be welcome.

* spot/twaalgos/minimize.cc: Replace the uses of twa methods by
twa_graph methods, and simplify some data structures.
* tests/core/acc_word.test, tests/core/readsave.test,
tests/python/automata.ipynb: Adjust changed output due
to different data structures.

* spot/gen/automata.hh, spot/gen/automata.cc,
bin/genaut.cc: Introduce L_DSA.
* tests/core/genaut.test: Add quick test.

* spot/gen/automata.cc: Set more properties.
* tests/python/gen.py: Check that they are set.

* spot/gen/automata.cc, spot/gen/automata.hh: Define AUT_L_NBA.
* bin/genaut.cc (--l-nba): New option.
* bin/man/genaut.x, doc/org/genaut.org, NEWS: Document it.
* tests/python/gen.py, tests/core/genaut.test: Test it.

* spot/gen/automata.hh (aut_pattern): Add the dict argument.
* spot/gen/automata.cc, python/spot/gen.i: Adjust.
* tests/python/gen.py: Make sure two automata built without
specifying any dictionary share the same one.

* spot/gen/automata.hh, spot/gen/automata.cc: Hide ks_cobuchi() behind
introduce aut_pattern(), as we have already done for the formulas.
* bin/genaut.cc: Simplify using this interface.
* python/spot/gen.i: Introduce aut_patterns().
* tests/python/gen.ipynb, tests/python/gen.py: Adjust.

This helps with autocompletion in IPython, and it will prevent us from
mixing LTL patterns with automata patterns (once we have more than one
automata generator).

* spot/gen/formulas.hh: Here.
* spot/gen/formulas.cc, bin/genltl.cc, tests/python/gen.ipynb,
tests/python/gen.py: Adjust.

* spot/gen/formulas.hh, spot/gen/formulas.cc (genltl): Rename as...
(ltl_pattern): This.
(ltl_pattern_max): New function.
* bin/genltl.cc: Adjust names, and simplify using ltl_pattern_max().
* python/spot/gen.i (ltl_patterns): New function.
* tests/python/gen.py: Test it.
* tests/python/gen.ipynb: New file to document the spot.gen package.
* tests/Makefile.am, doc/org/tut.org: Add gen.ipynb.

Fixes #254.

* spot/gen/formulas.cc, spot/gen/formulas.hh: New files.
* spot/gen/Makefile.am: Add them.
* spot/Makefile.am: Fix build order.
* bin/genltl.cc: Move most code to the above files and adjust.
* bin/Makefile.am: Link genltl with libspotgen.
* doc/org/arch.tex: Adjust picture to show that genltl uses
libspotgen.
* python/spot/gen.i: Include formulas.hh.
* tests/python/gen.py: Make sure genltl() and ltl_pattern_name()
can be called.

* spot/twaalgos/determinize.cc: remove code.

* tests/python/gen.py: implement the check.

* spot/gen/automata.cc: implement the change.

For #254.

* doc/org/arch.tex: Include libspotgen and its python bindings,
genaut, and also the buddy bindings.
* doc/org/concepts.org: Adjust the description.

For #254.

* python/spot/gen.i, tests/python/gen.py: New files.
* python/Makefile.am, tests/Makefile.am: Adjust.
* NEWS: Mention the spot.gen python package.

* bench/ltlcounter/README, doc/org/upgrade2.org: Here.

* spot/gen/automata.hh: State the precondition.
* spot/gen/automata.cc: Catch n==0.
* tests/core/genaut.test: Test it.

* tests/sanity/bin.test: New file.
* tests/Makefile.am: Run it.

* bin/man/genaut.x, doc/org/genaut.org: New files.
* bin/man/Makefile.am, doc/Makefile.am: Add them.
* doc/org/tools.org, bin/man/randaut.x, bin/man/randltl.x,
bin/man/genltl.x: Link to them.

* bin/common_aoutput.cc: Here.
* NEWS: Mention it.

* bin/genaut.cc: Use RANGE instead of N, and document it.
Output the FORMAT documentation, and fix handling of %F and %L.
* tests/core/genaut.test: New file.
* tests/Makefile.am: Add it.

Similarly to genltl that generates LTL formulas for various classes that
appear in the literature, genaut generates automata.

* NEWS: Mention the modification.
* bin/Makefile.am: Build the new binary.
* bin/genaut.cc: The new binary itself.

This library, called libspotgen, gathers functions to generate classes
of automata found in the literature.
Related to #254.

* NEWS, README: Mention the modification.
* Makefile.am, debian/control, debian/libspotgen0.install: Build the new
  library in a separate package.
* spot/gen/automata.hh, spot/gen/automata.cc: Add a family of co-Büchi
  automata.
* configure.ac, spot/Makefile.am, spot/gen/Makefile.am: Build the new
  library.