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Fixes #166.

* bin/genltl.cc: Add option --dac-patterns, --eh-patterns,
--sb-patterns.
* NEWS, bin/man/genltl.x, doc/org/genltl.org: Document them.
* bench/ltl2tgba/formulae.ltl: Delete.
* bench/ltl2tgba/known: Use genltl instead.
* bench/ltl2tgba/Makefile.am, bench/ltl2tgba/README: Update.
* tests/core/ltl2tgba2.test: New test case, using genltl.
* tests/Makefile.am: Add it.

* bench/ltl2tgba/Makefile.am, bench/ltl2tgba/defs.in:
Update location of tools.
* NEWS: Mention the fix.

Suggested by Akim Demaille.  Fixes #171.

* bin/man/spot.x, bin/spot.cc: New files.
* bin/man/Makefile.am, bin/Makefile.am: Add them.
* doc/org/tools.org, NEWS: Mention the new page.

* doc/org/spot.css: Here.

Fixes #168.

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

Part of #168.

* spot/misc/formater.cc: Adjust to support bracketed options.
* bin/common_trans.hh, bin/common_trans.cc: Use that to
support rewriting operators.
* doc/org/ltlcross.org, tests/core/ltldo.test: Add some examples.
* NEWS: Mention it.

Last part of #170.

* bin/autfilt.cc: Implement the new options.
* tests/core/remprop.test: Add a quick test.
* NEWS: Mention these options.

Part of #170.

* bin/autfilt.cc: Here.
* tests/core/remprop.test: Test it.
* NEWS: Mention it.

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.

* bin/autfilt.cc: Implement those options.
* NEWS: Mention them.
* doc/org/randaut.org: Add a quick example.
* tests/core/strength.test: Add some basic tests.
* tests/core/acc_word.test: Adjust options abbreviations.

* bin/ltldo.cc: Implement --errors.
* tests/core/ltldo.test: Test it.
* NEWS: Mention it.

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.

* spot/twaalgos/hoa.cc: Implement the option.
* bin/common_aoutput.cc, doc/org/hoa.org,
doc/org/oaut.org, spot/twaalgos/hoa.hh, NEWS: Document it.
* tests/core/strength.test: Test that.

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.