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Also introduce twa::unregister_ap() and twa_graph::remove_unused_ap()
so that the methods where this behavior is expected can be fixed.

And fix ltsmin::kripke() which did not register APs.

Part of #170.

* spot/twaalgos/hoa.cc: Use apvars() to print all registerd APs.
Throw an exception when printing automata using unregistered APs.
* spot/ltsmin/ltsmin.cc: Call register_ap().
* spot/twa/twa.cc, spot/twa/twa.hh, spot/twa/twagraph.cc,
spot/twa/twagraph.hh (twa::unregister_ap, twa_graph::remove_unused_ap):
New methods.
* spot/tl/exclusive.cc, spot/twaalgos/postproc.cc,
spot/twaalgos/remprop.cc, spot/twaalgos/relabel.cc: Use them.
* tests/core/maskacc.test, tests/core/maskkeep.test,
tests/core/strength.test: Adjust expected results.
* NEWS: Mention those changes.

Fixing this bug alone revealed another bug: parsing never claim or LBTT
automata did not register APs.  So this fixes both bugs.

This is the first part of #170.

* spot/twa/twa.hh (register_aps_from_dict): New method.
* spot/parseaut/parseaut.yy: Call it for never claim and LBTT files.
* spot/twaalgos/stats.cc: Simplify using ap_vars().
* tests/core/ltl2tgba.test: Add a test case.
* NEWS: Mention the bugs.

* bin/autfilt.cc: Here.
* tests/core/exclusive-tgba.test: Test it.
* NEWS: Mention the fix.

* python/spot/impl.i: Here.
* tests/python/automata.ipynb: Use it.
* NEWS: Mention it.

* HACKING: Here.

* bin/man/ltlcross.x, doc/org/ltlcross.org, doc/org/tools.org: Fix
one-line summaries.

Fixes #161, reported by Yann Thierry-Mieg.

* spot/twaalgos/emptiness.hh: Here.
* NEWS: Mention it.

This allows bitvect.hh to compile with icpc 16.0.2, but the whole
project does not yet compile due to a bug in 16.0.2 that prevents
compilation of unordered_map::emplace() from the STL shipped with GCC
5.3.1.

* spot/misc/bitvect.hh: adjust friend declarations.

The test is in the patch introducing HOA 1.1 output.

* spot/twaalgos/strength.cc: Here.
* NEWS: Mention the bug.

* spot/parseaut/scanaut.ll: Here.
* tests/core/strength.test: Add a test.
* NEWS: Mention the bug.

* bin/common_aoutput.cc: Fix --help output for -Hk.
* NEWS: Mention it.

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

* spot/kripke/kripkegraph.hh, spot/twa/twagraph.hh: Call
is_valid_edge() instead.
* NEWS: Mention the renaming.

* doc/org/concepts.org, doc/org/ltlcross.org, doc/org/ltldo.org,
python/ajax/trans.html, tools/man2html.pl: Update URLs.

Fixes #157.

* doc/org/concepts.org: Document the properties.
* doc/org/hoa.org: Link to it.
* NEWS: Mention the change.

* doc/org/arch.tex: New file.
* doc/Makefile.am: Compile it.
* doc/org/concepts.org: Show it.

* bin/common_range.hh: Store the common definition of words.
* bin/autfilt.cc: Use it.
* bin/ltlfilt.cc: Likewise, and implement those two options.
* tests/core/acc_word.test: Test them.
* doc/org/autfilt.org: Augment the last example to point out
that it can now be done with ltlfilt.
* NEWS: Mention the new options.

Fixes #159.

* python/spot/ltsmin.i: Here.
* python/spot/impl.i: Disable duplicate instantiation.
* tests/python/ltsmin.ipynb: Test it.

Fixes #160.

* spot/tl/formula.hh (formula::ap): New specialization.
* tests/python/ltsmin.ipynb: Test it.

Fixes #158, reported by Laurent Xu.

* tests/Makefile.am (TESTS_python): Move word.ipynb...
(TESTS_ipython): ... here.

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

Fixes #42.

* bench/stutter/stutter_invariance_formulas.cc, bin/autfilt.cc,
bin/common_output.cc, bin/dstar2tgba.cc, bin/ltl2tgba.cc,
bin/ltl2tgta.cc, bin/ltlcross.cc, bin/ltldo.cc, bin/ltlfilt.cc,
bin/ltlgrind.cc, spot/misc/intvcmp2.cc, spot/misc/intvcomp.cc,
spot/taalgos/dot.cc, spot/taalgos/statessetbuilder.cc,
spot/taalgos/stats.cc, spot/tl/relabel.cc, spot/tl/simplify.cc,
spot/tl/snf.cc, spot/twa/bdddict.cc, spot/twa/twaproduct.cc,
spot/twaalgos/degen.cc, spot/twaalgos/determinize.cc,
spot/twaalgos/dot.cc, spot/twaalgos/emptiness.cc,
spot/twaalgos/gtec/ce.cc, spot/twaalgos/ltl2tgba_fm.cc,
spot/twaalgos/magic.cc, spot/twaalgos/neverclaim.cc,
spot/twaalgos/se05.cc, spot/twaalgos/simulation.cc,
spot/twaalgos/tau03.cc, spot/twaalgos/tau03opt.cc: Add final.

* HACKING: Mention the no-tab rule.
* tests/sanity/style.test: Only test for it at the beginning of line.