* tests/Makefile.am (distclean-local): Erase python/core.

Alexandre Lewkowicz reported a case where complete() would peek an
existing state that is accepting, and wrongly use it as a sink.

* spot/twaalgos/complete.cc: Fix the function.
* tests/core/complete.test: Add two more tests.
* NEWS: Mention the bug.

* spot/parseaut/parseaut.yy: Here.
* tests/core/parseaut.test: Test it.
* NEWS: Mention it.

* spot/twa/twa.hh: Store property bits as trivals.
* NEWS: Mention the change.
* spot/parseaut/parseaut.yy, spot/twaalgos/are_isomorphic.cc,
spot/twaalgos/complete.cc, spot/twaalgos/dot.cc, spot/twaalgos/hoa.cc,
spot/twaalgos/isdet.cc, spot/twaalgos/isunamb.cc, spot/twaalgos/lbtt.cc,
spot/twaalgos/ltl2tgba_fm.cc, spot/twaalgos/postproc.cc,
spot/twaalgos/remfin.cc, spot/twaalgos/strength.cc,
spot/twaalgos/stutter.cc, spot/twaalgos/stutter.hh,
spot/twaalgos/totgba.cc, tests/core/ikwiad.cc,
tests/python/product.ipynb, tests/python/remfin.py: Adjust.
* doc/org/hoa.org, doc/org/tut21.org: Update documentation.

* spot/misc/trival.hh: New file.
* spot/misc/Makefile.am: Add it.
* python/spot_impl.i: Add Python bindings.
* tests/core/trival.cc, tests/core/trival.test,
tests/python/trival.py: New files, testing it.
* tests/Makefile.am: Add them.

* spot/twa/twagraph.cc, spot/twa/twagraph.hh,
tests/core/tgbagraph.test, tests/core/twagraph.cc,
NEWS: here.

Fixes #129.

* spot/twa/twa.cc (~twa): call unregister_all_my_variables()
* spot/twa/twagraph.hh, spot/twa/twaproduct.cc,
spot/twaalgos/stutter.cc: Simplify.
* NEWS: Mention the change.

* bin/common_aoutput.cc: Make HOA the default output.
* NEWS: Mention this.
* doc/org/autfilt.org, doc/org/dstar2tgba.org, doc/org/hoa.org,
doc/org/ltl2tgba.org, doc/org/ltl2tgta.org, doc/org/ltlcross.org,
doc/org/ltldo.org, doc/org/oaut.org, doc/org/randaut.org,
doc/org/satmin.org, doc/org/tut02.org, doc/org/tut03.org,
doc/org/tut20.org, doc/org/tut21.org, doc/org/tut30.org,
tests/core/dstar.test, tests/core/ltldo2.test, tests/core/monitor.test,
tests/python/piperead.ipynb: Adjust.

* bin/common_aoutput.cc, bin/common_aoutput.hh, bin/common_setup.cc:
Implement it.
* NEWS, bin/man/spot-x.x: Document it.
* tests/core/readsave.test: Test it.

* bin/common_aoutput.cc: Here.
* NEWS, doc/org/oaut.org: Mention it.
* tests/core/readsave.test: Use it once.

This is so that we can have -d as an alias for --dot everywhere.

* bin/randaut.cc: Rename -d as -e.
* NEWS: Mention the change.
* doc/org/autfilt.org, doc/org/oaut.org, doc/org/randaut.org,
tests/core/parseaut.test, tests/core/readsave.test: Adjust.

* doc/org/.dir-locals.el.in, doc/org/init.el.in: bin/ is no longer in
spot/.

* tests/Makefile.am (TESTS_python): Define conditionally.

* tests/Makefile.am (distclean-local): Here.

* spot/sanity/: Move ...
* tests/sanity/: ... here.
* spot/sanity/Makefile.am: Merge with...
* tests/Makefile.am: ... this.
* tests/run.in: Learn to run perl tests.
* README, configure.ac, spot/Makefile.am: Adjust.
* spot/tl/mark.hh: Add missing SPOT_API detected by
fixed private.test.

* spot/twaalgos/weight.cc, spot/twaalgos/weight.hh: Move...
* spot/priv/weight.cc, spot/priv/weight.hh: ... here, as
suggested by fixed private.test.
* spot/twaalgos/tau03opt.cc, spot/twaalgos/Makefile.am,
spot/priv/Makefile.am: Adjust.

* spot/ltsmin/defs.in: Delete.
* spot/ltsmin/README, spot/ltsmin/beem-peterson.4.dve,
spot/ltsmin/check.test, spot/ltsmin/elevator2.1.pm,
spot/ltsmin/finite.dve, spot/ltsmin/finite.pm, spot/ltsmin/finite.test,
spot/ltsmin/finite2.test, spot/ltsmin/kripke.test,
spot/ltsmin/modelcheck.cc: Move...
* tests/ltsmin/: ... here.
* spot/ltsmin/README: Point to tests/ltsmin/README.
* README, configure.ac, spot/ltsmin/Makefile.am, tests/.gitignore,
tests/Makefile.am, tests/core/defs.in: Adjust.

* tests/: Rename as...
* tests/core/: ... this.
* python/tests/: Rename as...
* tests/python/: ... this.
* python/tests/run.in: Move as...
* tests/run.in: This, and adjust.
* tests/Makefile.am: Adjust to run both core and python tests.
* configure.ac, README, debian/python3-spot.examples, debian/rules,
doc/org/tut.org, python/Makefile.am, spot/ltsmin/Makefile.am,
spot/ltsmin/kripke.test, spot/sanity/ipynb.test: Adjust.

* spot/bin/: Move...
* bin/: ... here.
* spot/tests/: Move...
* tests/: ... here.
* Makefile.am, README, bench/stutter/Makefile.am,
bench/stutter/stutter_invariance_formulas.cc, doc/Makefile.am,
configure.ac, debian/rules, spot/Makefile.am, spot/ltsmin/Makefile.am,
spot/ltsmin/kripke.test, spot/sanity/style.test, python/tests/run.in:
Adjust.

* python/tests/ipnbdoctest.py: Simply ignore %timeit blocks.

* spot-if/ltsmin/: Rename as...
* spot/ltsmin/: ... this.
* spot-if/: Delete.
* Makefile.am, NEWS, README, configure.ac, debian/libspot-dev.install,
doc/Doxyfile.in, spot/Makefile.am, spot/sanity/80columns.test,
spot/sanity/style.test: Adjust.

* wrap/python/: Rename to...
* python/: ... this.
* wrap/: Delete.
* Makefile.am, README, configure.ac, debian/python3-spot.examples,
debian/rules, doc/org/.dir-locals.el.in, doc/org/init.el.in,
spot/sanity/ipynb.test: Adjust.

* wrap/python/tests/product.ipynb: New file.
* wrap/python/tests/Makefile.am, doc/org/tut.org: Add it.
* wrap/python/tests/ipnbdoctest.py: Ignore %timeit results.
* wrap/python/spot_impl.i: Add bindings for
set_state_names()/get_state_names().
* spot/twaalgos/product.cc: Fix computation of properties.
* doc/org/hoa.org: Name.
* NEWS: Update.

Calling register_ap() with same atomic proposition several time, for
instance via copy_ap() in a product, would create duplicate atomic
propositions.  This fix will be exercised by the next patch.

* spot/twa/twa.hh: Here.
* spot/twaalgos/compsusp.cc, spot/twaalgos/ltl2taa.cc: Fix
to correctly register atomic propositions.
* NEWS: Mention it.

It is already in acc_cond::acc_code::generalized_buchi() along with all
other acceptance condition constructors.

* spot/twa/acc.hh (acc_cond::generalized_buchi): Remove.
* spot/tests/ikwiad.cc, spot/twaalgos/postproc.cc: Adjust.

* spot/twa/acc.hh, spot/twa/acc.cc (parse_acc_code): Rename as...
(acc_cond::acc_code): ... this, making it a lot easier to build
acceptance conditions from strings.
* NEWS: Mention the change.
* spot/twaalgos/dtwasat.cc, spot/bin/randaut.cc, spot/tests/acc.cc:
Adjust.
* wrap/python/tests/acc_cond.ipynb, wrap/python/tests/accparse.ipynb,
wrap/python/tests/accparse2.py: Simplify, but not completely to exercise
all variants.
* wrap/python/spot_impl.i: Make acc_code's constructor implicit.

* spot/twa/acc.hh: Here.
* wrap/python/spot_impl.i: Adjust for the strange return type of
unsat_mark().
* wrap/python/tests/acc_cond.ipynb: Augment.

* wrap/python/Makefile.am: Use more modern swig flags.

* wrap/python/spot_impl.i: Here.
* wrap/python/tests/acc_cond.ipynb: Document it.
* spot/twa/acc.cc (is_parity): Always initialize max.