Fixes #70.

We don't modify the behavior of mask_keep_states(), because it is
actually useful in some algorithm to remove states without renumbering
all the other states.

* src/bin/autfilt.cc: Call purge_dead_states().
* src/tgbatest/maskkeep.test: Adjust.

* src/tgba/acc.cc, src/tgba/acc.hh: Add a way to extract
an unstatisfiable mark, and fix the eval() function for
Fin acceptance.
* src/tgbaalgos/complete.cc: Label the sink state using
an unsatisfiable mark.  Do not assume generalized Büchi.
* src/tgbatest/complete.test: New test.
* src/tgbatest/Makefile.am: Add it.

Sometimes, simplifying the acceptance condition (because it refers to
sets that do not appear in the automaton) cause more sets to be removed
from the acceptance condition, and therefore warrant another pass to
remove those sets from the automaton.

* src/tgbaalgos/cleanacc.cc: Here.
* src/tgbatest/hoaparse.test: Add a test case.

* src/tgbaalgos/remprop.cc, src/tgbaalgos/remprop.hh: New files.
* src/tgbaalgos/Makefile.am: Add them.
* src/tgbatest/remprop.test: New test.
* src/tgbatest/Makefile.am: Add it.
* src/bin/autfilt.cc: Implement the option.
* doc/org/autfilt.org: Document it.

It makes more sense to assume that the removed set cannot be visited.

* src/tgbaalgos/mask.cc: Flip a Boolean.
* src/tgbatest/maskacc.test: Adjust test case.
* doc/org/autfilt.org: Add an example.

* src/tgba/tgbagraph.cc (purge_dead_states): Using a DFS to compute a
topological order, allowing to remove useless using a second
pass (instead of iterating the passes until there is nothing to remove).
* src/tgbaalgos/remfin.cc: Call purge_dead_states().
* src/tgbatest/remfin.test, src/tgbatest/det.test: Adjust expected
output.
* doc/org/autfilt.org: Update example.

* doc/org/oaut.org: Some typos.
* doc/org/autfilt.org: Add some examples.

* src/tgbaalgos/dotty.cc: Here.
* src/tgbaalgos/sbacc.cc: Make the produced automata as state-based.
* src/tgbatest/readsave.test: Add a test.

* src/ltlvisit/exclusive.cc, src/ltlvisit/exclusive.hh: Implement
constrain() for automata.
* src/bin/autfilt.cc: Add --exclusive-ap option.
* src/tgba/bdddict.cc, src/tgba/bdddict.hh: Add a
has_registered_proposition() method.
* src/tgbatest/exclusive.test: New file.
* src/tgbatest/Makefile.am: Add it.

* src/ltlvisit/exclusive.cc, src/ltlvisit/exclusive.hh: New files.
* src/ltlvisit/Makefile.am: Add them.
* src/bin/ltlfilt.cc: Implement the --exclusive-ap option.
* NEWS: Mention it.
* src/ltltest/exclusive.test: New file.
* src/ltltest/Makefile.am: Add it.

* iface/ltsmin/ltsmin.hh, src/bin/common_aoutput.hh,
src/bin/common_conv.hh, src/bin/common_cout.hh,
src/bin/common_file.hh, src/bin/common_finput.hh,
src/bin/common_output.hh, src/bin/common_post.hh,
src/bin/common_r.hh, src/bin/common_range.hh,
src/bin/common_setup.hh, src/bin/common_sys.hh,
src/bin/common_trans.hh, src/dstarparse/parsedecl.hh,
src/dstarparse/public.hh, src/graph/graph.hh,
src/graph/ngraph.hh, src/hoaparse/parsedecl.hh,
src/hoaparse/public.hh, src/kripke/fairkripke.hh,
src/kripke/fwd.hh, src/kripke/kripke.hh,
src/kripke/kripkeexplicit.hh, src/kripke/kripkeprint.hh,
src/kripkeparse/parsedecl.hh, src/kripkeparse/public.hh,
src/ltlast/allnodes.hh, src/ltlast/atomic_prop.hh,
src/ltlast/binop.hh, src/ltlast/bunop.hh,
src/ltlast/constant.hh, src/ltlast/formula.hh,
src/ltlast/multop.hh, src/ltlast/predecl.hh,
src/ltlast/unop.hh, src/ltlast/visitor.hh,
src/ltlenv/declenv.hh, src/ltlenv/defaultenv.hh,
src/ltlenv/environment.hh, src/ltlparse/parsedecl.hh,
src/ltlparse/public.hh, src/ltlvisit/apcollect.hh,
src/ltlvisit/clone.hh, src/ltlvisit/contain.hh,
src/ltlvisit/dotty.hh, src/ltlvisit/dump.hh,
src/ltlvisit/lbt.hh, src/ltlvisit/length.hh,
src/ltlvisit/lunabbrev.hh, src/ltlvisit/mark.hh,
src/ltlvisit/mutation.hh, src/ltlvisit/nenoform.hh,
src/ltlvisit/postfix.hh, src/ltlvisit/randomltl.hh,
src/ltlvisit/relabel.hh, src/ltlvisit/remove_x.hh,
src/ltlvisit/simpfg.hh, src/ltlvisit/simplify.hh,
src/ltlvisit/snf.hh, src/ltlvisit/tostring.hh,
src/ltlvisit/tunabbrev.hh, src/ltlvisit/wmunabbrev.hh,
src/misc/bareword.hh, src/misc/bddlt.hh, src/misc/bitvect.hh,
src/misc/casts.hh, src/misc/common.hh, src/misc/escape.hh,
src/misc/fixpool.hh, src/misc/formater.hh, src/misc/hash.hh,
src/misc/hashfunc.hh, src/misc/intvcmp2.hh,
src/misc/intvcomp.hh, src/misc/location.hh, src/misc/ltstr.hh,
src/misc/memusage.hh, src/misc/minato.hh, src/misc/mspool.hh,
src/misc/optionmap.hh, src/misc/position.hh, src/misc/random.hh,
src/misc/satsolver.hh, src/misc/timer.hh, src/misc/tmpfile.hh,
src/misc/version.hh, src/priv/accmap.hh, src/priv/bddalloc.hh,
src/priv/freelist.hh, src/ta/ta.hh, src/ta/taexplicit.hh,
src/ta/taproduct.hh, src/ta/tgta.hh, src/ta/tgtaexplicit.hh,
src/ta/tgtaproduct.hh, src/taalgos/dotty.hh,
src/taalgos/emptinessta.hh, src/taalgos/minimize.hh,
src/taalgos/reachiter.hh, src/taalgos/statessetbuilder.hh,
src/taalgos/stats.hh, src/taalgos/tgba2ta.hh,
src/tgba/acc.hh, src/tgba/bdddict.hh,
src/tgba/bddprint.hh, src/tgba/formula2bdd.hh, src/tgba/fwd.hh,
src/tgba/taatgba.hh, src/tgba/tgba.hh, src/tgba/tgbagraph.hh,
src/tgba/tgbamask.hh, src/tgba/tgbaproduct.hh, src/tgba/tgbaproxy.hh,
src/tgba/tgbasafracomplement.hh, src/tgbaalgos/are_isomorphic.hh,
src/tgbaalgos/bfssteps.hh, src/tgbaalgos/canonicalize.hh,
src/tgbaalgos/cleanacc.hh, src/tgbaalgos/complete.hh,
src/tgbaalgos/compsusp.hh, src/tgbaalgos/cycles.hh,
src/tgbaalgos/degen.hh, src/tgbaalgos/dotty.hh,
src/tgbaalgos/dtbasat.hh, src/tgbaalgos/dtgbacomp.hh,
src/tgbaalgos/dtgbasat.hh, src/tgbaalgos/dupexp.hh,
src/tgbaalgos/emptiness.hh, src/tgbaalgos/emptiness_stats.hh,
src/tgbaalgos/gtec/ce.hh, src/tgbaalgos/gtec/gtec.hh,
src/tgbaalgos/gtec/sccstack.hh, src/tgbaalgos/gtec/status.hh,
src/tgbaalgos/gv04.hh, src/tgbaalgos/hoa.hh, src/tgbaalgos/isdet.hh,
src/tgbaalgos/isweakscc.hh, src/tgbaalgos/lbtt.hh,
src/tgbaalgos/ltl2taa.hh, src/tgbaalgos/ltl2tgba_fm.hh,
src/tgbaalgos/magic.hh, src/tgbaalgos/mask.hh,
src/tgbaalgos/minimize.hh, src/tgbaalgos/neverclaim.hh,
src/tgbaalgos/postproc.hh, src/tgbaalgos/powerset.hh,
src/tgbaalgos/product.hh, src/tgbaalgos/projrun.hh,
src/tgbaalgos/randomgraph.hh, src/tgbaalgos/randomize.hh,
src/tgbaalgos/reachiter.hh, src/tgbaalgos/reducerun.hh,
src/tgbaalgos/relabel.hh, src/tgbaalgos/remfin.hh,
src/tgbaalgos/replayrun.hh, src/tgbaalgos/safety.hh,
src/tgbaalgos/sbacc.hh, src/tgbaalgos/scc.hh,
src/tgbaalgos/sccfilter.hh, src/tgbaalgos/sccinfo.hh,
src/tgbaalgos/se05.hh, src/tgbaalgos/simulation.hh,
src/tgbaalgos/stats.hh, src/tgbaalgos/stripacc.hh,
src/tgbaalgos/stutter.hh, src/tgbaalgos/tau03.hh,
src/tgbaalgos/tau03opt.hh, src/tgbaalgos/translate.hh,
src/tgbaalgos/weight.hh, src/tgbaalgos/word.hh,
src/sanity/includes.test, src/tgbaalgos/ndfs_result.hxx: here.

* configure.ac: here.

Fixes #67.

* src/tgba/tgba.cc, src/tgba/tgba.hh: Here.
* src/tgbaalgos/complete.cc, src/tgbaalgos/stripacc.cc: Use it.

This is another part of the SVG output thay may change
with different versions of graphviz.

* wrap/python/tests/ipnbdoctest.py: Here.

Fixes #68.

* configure.ac: Here.

... or the pointer might be invalidated if the environments
changes.  Fixes #63.

* src/taalgos/dotty.cc, src/tgbaalgos/dotty.cc,
src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbasat.cc:
Copy the environment in strings instead.
* wrap/python/tests/automata.ipynb: Adjust comment.

* src/hoaparse/hoaparse.yy: Make sure initial states are
declared.
* src/tgbatest/hoaparse.test: Test it.

Fixes #64.

* src/tgba/tgba.hh: Here.
* src/tgbaalgos/complete.cc, src/tgbaalgos/degen.cc,
src/tgbaalgos/dtgbacomp.cc, src/tgbaalgos/mask.cc,
src/tgbaalgos/minimize.cc, src/tgbaalgos/remfin.cc,
src/tgbaalgos/sccfilter.cc, src/tgbaalgos/simulation.cc,
src/tgbaalgos/stutter.cc: Adjust.

* src/tgba/tgbagraph.hh (set_generalized_buchi, set_buchi): Move...
* src/tgba/tgba.hh: ... here.

Fixes #66.

* src/dstarparse/dra2ba.cc, src/dstarparse/nra2nba.cc,
src/hoaparse/hoaparse.yy, src/tgba/tgbagraph.hh,
src/tgbaalgos/complete.cc, src/tgbaalgos/degen.cc,
src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbacomp.cc,
src/tgbaalgos/minimize.cc, src/tgbaalgos/postproc.cc: Here.

Fixes #65.

* src/tgba/tgbagraph.hh (copy_acceptance_of, copy_ap_of): Move...
* src/tgba/tgba.hh: ... here.

... into copy_acceptance_of().  For #65.

* src/tgba/tgbagraph.hh, src/tgbaalgos/dupexp.cc,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/mask.cc,
src/tgbaalgos/powerset.cc, src/tgbaalgos/sbacc.cc,
src/tgbaalgos/simulation.cc, src/tgbaalgos/stutter.cc: Here.

* wrap/python/tests/automata.ipynb: Restrict dot size, and more
examples.

* debian/control: Update standars-version.  Add missing ${misc:Depends}.
Use Depends: ${source:Version} for libspot-dev.  Fix description of
spot.
* debian/spot-doc.doc-base: Move the doc to Science/Mathematics.

Fixes #62.

* src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbasat.cc: Add call to
prop_state_based_acc() when building an automaton with state-based
acceptance.
* src/tgbatest/satmin2.test: New test.
* doc/org/satmin.org: Update.

* src/bin/man/Makefile.am: Make sure the header of spot-x.7 refers to
section 7, not 1.  This error was caught by lintian on the Debian
packages.

This implement several new options for --dot in order to
allow emptiness sets to be output as colored ⓿ or ❶...
Also add a SPOT_DOTDEFAULT environment variable.

* NEWS, src/bin/man/spot-x.x, src/bin/common_aoutput.cc,
src/bin/dstar2tgba.cc: Document the new options.
* doc/org/.dir-locals.el, doc/org/init.el.in: Setup
SPOT_DOTEXTRA and SPOT_DOTDEFAULT for all documents.
* doc/org/autfilt.org, doc/org/dstar2tgba.org, doc/org/ltl2tgba.org,
doc/org/ltldo.org, doc/org/oaut.org, doc/org/randaut.org,
doc/org/satmin.org: Adjust to this new setup.
* src/misc/escape.cc, src/misc/escape.hh (escape_html): New function.
* src/tgba/acc.cc, src/tgba/acc.hh (to_text, to_html): New method.
* src/tgbaalgos/dotty.cc: Implement the new options.
* src/tgbatest/readsave.test, wrap/python/tests/automata.ipynb: More
tests.
* wrap/python/spot.py: Make sure the default argument for
dotty_reachable is None, so that SPOT_DOTDEFAULT is honored.

* src/tgbaalgos/dotty.cc, src/taalgos/dotty.cc: Honnor the SPOT_DOTEXTRA
environement variable.
* src/tgbatest/readsave.test, wrap/python/tests/automata.ipynb: Test it.
* NEWS, src/bin/man/spot-x.x: Document it.

One of our ArchLinux build produice slightly different SVG.

* wrap/python/tests/ipnbdoctest.py: Strip larger parts of SVG outputs.

* wrap/python/spot.py: Introduce spot.translate (and
spot.formula.translate) as well, as a wrapper around the
spot.translator class.  Also implement spot.tgba.show()
to allow passing argument to dotty_reachable() before
the result is converted to SVG.
* wrap/python/tests/automata.ipynb: New test file.
* wrap/python/tests/Makefile.am: Add it.

* wrap/python/tests/ipnbdoctest.py: Ignore anything that look like an
SVG coordinate to compare outputs.

* src/fdd.c, src/imatrix.c, src/kernel.c, src/reorder.c: Here.

With great help from the first two commits in
https://github.com/paulgb/runipy/pull/49/commits

* wrap/python/tests/ipnbdoctest.py: Update.

* src/misc/escape.hh, src/misc/escape.cc (escape_latex): New function.
* src/ltlvisit/tostring.cc: Escape atomic proposition in LaTeX output.
* wrap/python/spot.py: Make it easy to output formulas in different
syntaxes.  Also allow the AST to be shown.
* wrap/python/spot_impl.i: Catch std::runtime_error.
* wrap/python/tests/formulas.ipynb: New file.
* wrap/python/tests/Makefile.am: Add it.

* debian/control: Make sure libspot-dev and spot have
the same versions.

The bug was found while running Spot's src/tgbatest/randpsl.test
on Debian i386 with gcc-4.9.2.  The following call would crash:

./ltl2tgba -R3 -t '(!(F(({{{(p0) |
{[*0]}}:{{{(p1)}[*2]}[:*]}[*]:[*2]}[:*0..3]}[]-> (G(F(p1)))) &
(G((!(p1)) | ((!(p2)) W (G(!(p0)))))))))'

On amd64 the call does not crash, but valgrind nonetheless
report that uninitialized memory is being read by bdd_gbc()
during the second garbage collect.

* src/kernel.h (PUSHREF): Define as a function rather than a macro
to avoid undefined behavior.  See comments for details.