* doc/org/spot.css: Display input and output closer and separate them
with dash.

* doc/org/hierarchy.tex: Draw the shadow manually, so that it is part
of the bounding box when we extract the SVG.

* configure.ac, NEWS, doc/org/setup.org: Set version to 2.9.3.

* doc/org/autcross.org, doc/org/autfilt.org, doc/org/citing.org,
doc/org/compile.org, doc/org/concepts.org, doc/org/csv.org,
doc/org/dstar2tgba.org, doc/org/genaut.org, doc/org/genltl.org,
doc/org/hierarchy.org, doc/org/hoa.org, doc/org/index.org,
doc/org/install.org, doc/org/ltl2tgba.org, doc/org/ltl2tgta.org,
doc/org/ltlcross.org, doc/org/ltlfilt.org, doc/org/ltlgrind.org,
doc/org/ltlsynt.org, doc/org/oaut.org, doc/org/randaut.org,
doc/org/randltl.org, doc/org/satmin.org, doc/org/tut.org,
doc/org/tut01.org, doc/org/tut02.org, doc/org/tut03.org,
doc/org/tut04.org, doc/org/tut10.org, doc/org/tut11.org,
doc/org/tut12.org, doc/org/tut20.org, doc/org/tut21.org,
doc/org/tut22.org, doc/org/tut23.org, doc/org/tut24.org,
doc/org/tut30.org, doc/org/tut31.org, doc/org/tut50.org,
doc/org/tut51.org, doc/org/tut52.org, doc/org/tut90.org,
doc/org/upgrade2.org: Run ispell-buffer on all these.
* bin/autfilt.cc, python/spot/__init__.py: Fix typos in
help texts noticed while spell-checking the org files.

* doc/org/.dir-locals.el.in, doc/org/init.el.in: Set the
SPOT_UNINSTALLED envvar, as we already do in the test suite.

* doc/org/autcross.org, doc/org/autfilt.org, doc/org/citing.org,
doc/org/compile.org, doc/org/concepts.org, doc/org/csv.org,
doc/org/dstar2tgba.org, doc/org/genaut.org, doc/org/genltl.org,
doc/org/hierarchy.org, doc/org/hoa.org, doc/org/index.org,
doc/org/install.org, doc/org/ltl2tgba.org, doc/org/ltl2tgta.org,
doc/org/ltlcross.org, doc/org/ltlfilt.org, doc/org/ltlgrind.org,
doc/org/ltlsynt.org, doc/org/oaut.org, doc/org/randaut.org,
doc/org/randltl.org, doc/org/satmin.org, doc/org/tut.org,
doc/org/tut01.org, doc/org/tut02.org, doc/org/tut03.org,
doc/org/tut04.org, doc/org/tut10.org, doc/org/tut11.org,
doc/org/tut12.org, doc/org/tut20.org, doc/org/tut21.org,
doc/org/tut22.org, doc/org/tut23.org, doc/org/tut24.org,
doc/org/tut30.org, doc/org/tut31.org, doc/org/tut50.org,
doc/org/tut51.org, doc/org/tut52.org, doc/org/tut90.org,
doc/org/upgrade2.org: Run ispell-buffer on all these.
* bin/autfilt.cc, python/spot/__init__.py: Fix typos in
help texts noticed while spell-checking the org files.

* doc/org/.dir-locals.el.in, doc/org/init.el.in: Set the
SPOT_UNINSTALLED envvar, as we already do in the test suite.

* configure.ac, NEWS, doc/org/setup.org: Set version to 2.9.2.

* configure.ac: Activate C++17, and replace --enable-c++17 by
--enable-c++20.
* NEWS: Mention the news.
* .gitlab-ci.yml: Use C++20 for the former C++17 builds.
* HACKING, README, doc/org/compile.org, doc/org/concepts.org,
doc/org/index.org, doc/org/install.org, doc/org/tut.org,
doc/org/upgrade2.org, spot/misc/escape.hh: Adjust mentions
of C++14.

* configure.ac, NEWS, doc/org/setup.org: Set version to 2.9.1.

* configure.ac, doc/org/setup.org, NEWS: Set version to 2.9.

* doc/org/autfilt.org: Add examples for --simplify-acc and --parity.

* spot/twaalgos/toparity.hh: Improve doc, and rename car_option into
to_parity_options.
* doc/spot.bib: Add one reference.
* python/spot/__init__.py, spot/twaalgos/toparity.cc,
tests/python/toparity.py: Adjust.

* NEWS, configure.ac, doc/org/setup.org: Update.

* doc/org/tut12.org: Here.

* doc/org/tut12.org: Here.

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

* doc/spot.bib: Here.
* doc/tl/tl.tex: Fix a citation.

* doc/spot.bib (klein.07.ciaa, redziejowski.12.fi): Add two entries.
* spot/twaalgos/determinize.hh: Use them.

* doc/org/citing.org, doc/spot.bib: Here.

* doc/spot.bib: Here.
* doc/tl/tl.tex: Fix a citation.

* doc/spot.bib (klein.07.ciaa, redziejowski.12.fi): Add two entries.
* spot/twaalgos/determinize.hh: Use them.

* doc/org/citing.org, doc/spot.bib: Here.

Suggested by František Blahoudek.

* bin/ltlcross.cc: Implement this.
* NEWS, doc/org/ltlcross.org: Document it.
* tests/core/ltlcross4.test: Test it.

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

* NEWS, configure.ac, doc/org/setup.org: Set version to 2.8.4.

* doc/org/arch.tex: Improve diagram, add links and online services.
* doc/org/concepts.org: Update text.

* spot/twaalgos/stutter.cc,
spot/twaalgos/stutter.hh (check_stutter_invariance): Add a
find_counterexamples argument.
* spot/twaalgos/hoa.cc: Output accepted-word and rejected-word examples.
* bin/common_aoutput.cc: Handle --check=stutter-sensitive-example.
* NEWS: Mention it.
* tests/core/stutter-tgba.test: Test it.
* doc/org/concepts.org, doc/org/hoa.org: Document accepted-word and
rejected-word named properties.
* bin/man/spot-x.x: Mention that --check=stutter-sensitive-example
ignores SPOT_STUTTER_CHECK.

* doc/org/arch.tex: Improve diagram, add links and online services.
* doc/org/concepts.org: Update text.

* NEWS, configure.ac, doc/org/setup.org: Set version to 2.8.3.

* NEWS, configure.ac, doc/org/setup.org: Update version to 2.8.2.