* src/ltlvisit/remove_x.cc, src/ltltest/remove_x.test: here.

Add these two options as an answer to comments in
https://github.com/adl/hoaf/issues/39

* src/bin/autfilt.cc: Add those options.  Also
make --keep-state use --remove-unreachable-states
instead of the less efficient --remove-dead-states
by default.
* src/tgbatest/readsave.test: Test them.

This was discussed in the comments of
https://github.com/adl/hoaf/issues/39

* src/hoaparse/hoaparse.yy: Rename defined_states as info_states
and keep additional information about states in this vector to
diagnose undefined states.
* src/tgbatest/hoaparse.test: Add a test case.

* src/tgbaalgos/stutter.cc: Add a new variant of Etessami's check,
closer to his original paper in IPL.
* src/ltltest/stutter.test: Add more tests.
* bench/stutter/user.sh: Include this new variant in the benchmark.

* src/tgbaalgos/dotty.cc: Add option 'o'.
* src/bin/common_aoutput.cc, src/bin/dstar2tgba.cc: Document it.
* src/taalgos/dotty.cc: Ignore this option.
* src/tgbatest/readsave.test: Test it.

* src/tgba/acc.cc, src/tgba/acc.hh (parse_acc_code): New function.
* src/tgbatest/acc.cc, src/tgbatest/acc.test: Test it.

* src/tgba/acc.hh: Make it possible to call acc_cond::mark_t({1,2,3}),
and acc_code::fin({1,2,3}).

Some tests calling spot.automaton('non-existing|') where failing either
with a "process returned 127", or, under heavier load, with "failed to
read from...".  The latter occur if we poll() the exit status before the
children has had the tame to finish.

* wrap/python/spot.py: Make sure we wait for the child process if we
reach EOF, so that we can report the error status.
* wrap/python/tests/automata-io.ipynb, wrap/python/tests/piperead.ipynb:
Update.

* wrap/python/tests/ipnbdoctest.py: Store all the history
in memory.

For #42.

* src/graph/graph.hh, src/ltlast/multop.hh, src/ltlenv/defaultenv.hh,
src/misc/tmpfile.hh, src/tgba/taatgba.hh, src/tgba/tgbagraph.hh,
src/tgba/tgbaproduct.hh, src/tgbaalgos/gtec/gtec.hh: Declare more
classes as final.

* wrap/python/tests/run.in: Make it easier to run python with gdb.
* wrap/python/tests/automata-io.ipynb: Add test case.
* wrap/python/spot.py (spot.automata): Make sure p is defined in all
cases.
* src/hoaparse/hoascan.ll: Make sure we do not close a file that
hasn't been opened.

Fixes #73.

* debian/python3-spot.examples: New file.
* Makefile.am: Distribute it.

* src/tgbaalgos/totgba.cc: false must become true...
* src/tgbatest/remfin.test: adjust.

Fixes #72.

* src/tgbaalgos/totgba.cc, src/tgbaalgos/totgba.hh: New files.
* src/tgbaalgos/Makefile.am: Add them.
* src/tgbaalgos/postproc.cc, src/tgbaalgos/postproc.hh: Add
a Generic output type, and call to_generalized_buchi() if
this type is not selected.
* src/tgbatest/remfin.test: Add some tests.
* src/bin/autfilt.cc: Add a --generic option, and set it
by default.

* src/taalgos/dotty.cc, src/taalgos/dotty.hh: Add an interface
similar to that of tgba/dotty.hh, even if we have to ignore
most options.
* src/taalgos/tgba2ta.cc, src/taalgos/tgba2ta.hh: Add an option
to display the intermediate automaton with explicit stuttering
transitions, for the purpose of making demonstrations.
* src/tgba/tgbagraph.hh: Tweak the file so that SWIG can
read it.
* wrap/python/spot.py: Add wrappers for testing automata.
* wrap/python/spot_impl.i: Fix support for
atomic_prop_collect_as_bdd, and include a few more files.
* wrap/python/tests/testingaut.ipynb: New file.
* wrap/python/tests/Makefile.am: Add it.

* src/tgbaalgos/degen.cc, src/tgbaalgos/degen.hh: New argument
to disable the "jump to the accepting level if the entering
state as an accepting self-loop" optimization.
* src/tgbaalgos/postproc.cc, src/tgbaalgos/postproc.hh: Check
the degen-lowinit option and pass it on to degeneralize().
* src/bin/spot-x.cc: Document it.
* src/tgbatest/degenlskip.test: Add some tests.
* src/tgbatest/ltl2ta.test: Update value.  We output less
accepting states now.

Doing so is not wrong, but it's superfluous, and the extra accepting
state will cause additional work in emptiness checks based on NDFS.
Report from Jan Strejček.

* src/tgbaalgos/degen.cc: Here.
* src/tgbatest/degenid.test: Add a test case.

* wrap/python/spot.py: Here.

* m4/pypath.m4: Check for Python 3.2+.
* README, NEWS, HACKING: Reflect this change.

if a transition with the same label already exist, reuse it

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

Fixes #71.

* src/bin/randaut.cc: Implement option --acc-type.
* src/tgbaalgos/randomgraph.cc,
src/tgbaalgos/randomgraph.hh (random_acceptance): New function.
* src/tgbatest/randaut.test, wrap/python/tests/randaut.ipynb: Test it.

* wrap/python/spot_impl.i: Include cleanacc.hh.
* wrap/python/tests/randaut.ipynb: New file.
* wrap/python/tests/Makefile.am: Add it.

And add a cleanup_acceptance() version that copies.

* src/tgbaalgos/cleanacc.cc, src/tgbaalgos/cleanacc.hh: Rename
and add the second version.
* src/bin/autfilt.cc, src/bin/ltlcross.cc,
src/tgbaalgos/dtgbacomp.cc, src/tgbaalgos/remfin.cc: Use
cleanup_acceptance_here.

* src/bin/common_trans.cc: Update to expect HOA by default.
* doc/org/ltlcross.org, doc/org/ltldo.org: Adjust.

* src/hoaparse/hoaparse.yy, src/hoaparse/hoascan.ll,
src/hoaparse/parsedecl.hh, src/hoaparse/public.hh:
Add a way to read automata from a file descriptor.
* wrap/python/spot.py: Add machinery to read from
pipes.
* wrap/python/tests/piperead.ipynb: New file.
* wrap/python/tests/Makefile.am: Add it.
* wrap/python/tests/run.in: Setup PATH.

* src/bin/autfilt.cc: Add option.
* src/ltlvisit/exclusive.cc, src/ltlvisit/exclusive.hh: implement it.
* src/tgbatest/exclusive.test: Test it.
* src/misc/minato.cc, src/misc/minato.hh: Add an interface to
simplify a Boolean function with don't care.

* src/hoaparse/fmterror.cc, src/hoaparse/public.hh,
src/hoaparse/hoaparse.yy (hoa_stream_parser::parse_strict): New method
that raises an exception whenever a syntax error is encountered.
* src/ltlparse/public.hh (parse_error): Move ...
* src/misc/common.hh: ... here.
* wrap/python/spot_impl.i: Wrap the hoa output.
* wrap/python/spot.py: Implement spot.automata.
* wrap/python/tests/automata-io.ipynb: New test.
* wrap/python/tests/Makefile.am: Add it.

Suggested by Akim Demaille.  Fixes #69.

* doc/org/.dir-locals.el, doc/org/init.el.in,
wrap/python/tests/automata.ipynb: Set arrowhead and arrowsize.
* doc/org/autfilt.org, doc/org/dstar2tgba.org,
doc/org/ltl2tgba.org, doc/org/oaut.org: Adjust.

This work around what appears to be an exception handling bug, causing
binaries to not always catch excepting thrown by the library.

* debian/rules: Here.

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.