Inspired by #375.

* README: Add a section about troubleshooting installations.  Mention
GraphViz as optional dependency.
* doc/org/install.org: Mention the troubleshooting section from INSTALL.

This fixes an issue mentioned in #375.

* python/spot/aux.py (str_to_svg): Catch a missing 'dot' and instruct
the user to install GraphViz.
* THANKS: Add reporter.

* spot/twaalgos/powerset.cc: Remove some unnecessary code, as spotted
by Fanda.  Also fix some comments.

See the following email
http://lists.gnu.org/archive/html/emacs-orgmode/2019-01/msg00226.html

* doc/org/tut24.org, doc/org/tut51.org: Export the output of
noweb-based block without ':export results' or ':export both'.
* doc/org/spot.css: Add style for src-text.

Fixes #372.

* python/spot/impl.i: Refactor the handling of exceptions using a
Lippincott function.  Map out_of_range to IndexError.  Add
PyObject* version for bdd_dict's register and unregister functions
so we can use Python objects as well.
* tests/python/bdddict.py: New file.
* tests/Makefile.am: Add it.
* NEWS: Mention the changes.

* bin/common_setup.cc, debian/copyright: Here.

* doc/org/concepts.org: Typo reported by Paul Guénézan.
* THANKS: Add him.

* spot/tl/dot.cc: Here.
* tests/python/formulas.ipynb: Add test case.
* NEWS: Mention the bug.

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

Issue discovered by Mikuláš Klokočka and reported by František
Blahoudek.

* spot/twaalgos/translate.cc: Reset the stutter-invariant flag
when adding extra transitions for leading Xs.
* tests/core/stutter-tgba.test: New test case.
* NEWS: Mention the bug.

* .gitlab-ci.yml: Here.

* .gitlab-ci.yml: Here.

* bin/common_finput.hh,
bin/common_trans.cc,
bin/common_trans.hh,
spot/misc/minato.hh,
spot/ta/ta.cc,
spot/ta/ta.hh,
spot/twa/acc.hh,
spot/twaalgos/cycles.hh,
spot/twaalgos/emptiness.hh,
spot/twaalgos/gtec/gtec.hh,
spot/twaalgos/ndfs_result.hxx,
spot/twaalgos/sccinfo.hh,
spot/twaalgos/word.cc,
spot/twaalgos/word.hh: Here.

* .gitlab-ci.yml (alpine-gcc): Here.

* spot.spec.in: Do not hardcode the Python version.

Reported by Maxime Bouton.

* spot/misc/tmpfile.cc: Include stdlib.h, not cstdlib, so
that our replacement secure_getenv() is found.
* THANKS: Add Maxime.

* spot/twa/acc.cc: Recoginize the single-pair case.
* python/spot/impl.i: Return the vector instead of taking it
by reference.
* tests/python/setacc.py: Add test cases.
* NEWS: Mention those changes.

Fixes #368, suggested by František Blahoudek.

* spot/twaalgos/isdet.cc, spot/twaalgos/isdet.hh
(count_univbranch_states(), count_univbranch_edges()): New functions.
* bin/common_aoutput.cc, bin/common_aoutput.hh: Add %u and variants.
* NEWS: Mention these.
* tests/core/alternating.test: Test them.

* NEWS: Mention the change.
* python/spot/__init__.py: Add _repr_latex_ for twa_word, and
remove __repr__ and __str__ for atomic_prop_set.
* python/spot/impl.i: Implement __repr__ and __str__ for
atomic_prop_set.  Fix __repr__ for trival, acc_code, acc_cond,
mark_t.  Remove __repr__ for twa_run and twa_word.
* tests/python/acc_cond.ipynb, tests/python/accparse.ipynb,
tests/python/atva16-fig2a.ipynb, tests/python/automata.ipynb,
tests/python/bdditer.py, tests/python/contains.ipynb,
tests/python/gen.ipynb, tests/python/highlighting.ipynb,
tests/python/ltlsimple.py, tests/python/ltsmin-dve.ipynb,
tests/python/product.ipynb, tests/python/relabel.py,
tests/python/satmin.ipynb tests/python/stutter-inv.ipynb,
tests/python/word.ipynb: Adjust test cases.
* tests/python/formulas.ipynb: Add test for atomic_prop_set.

* spot/twa/acc.hh: Hide default constructors, so that we can have
keyword arguments on the main constructor.
* python/spot/impl.i: Add __repr__.
* tests/python/setacc.py: Test it.

* python/spot/impl.i: Fix instantiation of vector_rs_pairs.
* tests/python/setacc.py: Add test cases.
* NEWS: Mention the bugs.

* python/spot/impl.i: Here.
* tests/python/setacc.py: Test it.
* NEWS: Mention the bug.

* spot/parseaut/parseaut.yy, spot/parsetl/parsetl.yy: Explicitly Bison
3.0, and use a code argument instead of an (deprecated) string
argument for api.location.type.

* spot/parseaut/parseaut.yy: Here.

Fixes #361.

* python/spot/__init__.py: Implement it.
* tests/python/optionmap.py: Test it.
* NEWS: Mention it.

* NEWS, configure.ac: Here.

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

* NEWS: Mention the issue.
* bin/ltlfilt.cc: Fix test.
* tests/core/acc_word.test: Test this.

Fixes #367.

* spot/twaalgos/translate.cc, spot/twaalgos/translate.hh: Fix it.
* NEWS: Mention the change.
* tests/core/ltl2tgba2.test: Test this.

Fixes #366, reported by Simon Jantsch.

* spot/twaalgos/translate.cc: type_&Generic will also match if
type_==BA... use type_==Generic instead.
* tests/core/unambig.test: Add a test corresponding to Simon's report.
* NEWS: Describe the bug.

* tests/python/_product_weak.ipynb: Split large loop in two cells.

* spot/twaalgos/strength.cc, spot/twaalgos/strength.hh,
spot/tl/hierarchy.cc, spot/tl/hierarchy.hh: Here.
* bin/ltlfilt.cc (--liveness): New filter.
* NEWS: Mention those.
* tests/core/ltlfilt.test, tests/python/ltlsimple.py: Add test cases.