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* bin/genltl.cc, spot/gen/formulas.cc, spot/gen/formulas.hh: Implement
  it.
* tests/core/genltl.test: Test it.
* NEWS: Document it.

* spot/gen/formulas.cc, spot/gen/formulas.hh, bin/genltl.cc:
Implement them.
* NEWS, bin/man/genltl.x: Document them.
* tests/core/genltl.test: Add some tests.

* spot/gen/automata.cc, spot/gen/automata.hh, bin/genaut.cc: Rename
the enum, function, and command-line option.
* tests/core/genaut.test, tests/python/gen.ipynb, tests/python/gen.py:
Adjust test cases.
* doc/org/genaut.org: Adjust doc.

As suggested in #263.

* spot/gen/formulas.cc, spot/gen/formulas.hh, bin/genltl.cc: Implement
these options.
* tests/core/genltl.test: Use them.
* NEWS: Mention them.

The libtool version distributed by Debian is patched to *not* propagate
dependencies (i.e., if libA depends on libB, then linking against libA
will not automatically link against libB, it has to be explicit),
contrary to what the Libtool manual document.  So now we explicitly
link against both libA and libB in such case.

* configure.ac: Remove the workaround that does not work for
MinGW.
* doc/org/compile.org: Mention the issue.
* bin/Makefile.am, tests/Makefile.am, spot/ltsmin/Makefile.am,
spot/gen/Makefile.am, doc/org/g++wrap.in: Make the dependencies
explicit.

* spot/gen/libspotgen.pc.in: New file.
* spot/gen/Makefile.am: Install libspotgen.pc.
* debian/libspot-dev.install: Update.

* spot/gen/automata.hh, spot/gen/automata.cc,
bin/genaut.cc: Introduce L_DSA.
* tests/core/genaut.test: Add quick test.

* spot/gen/automata.cc: Set more properties.
* tests/python/gen.py: Check that they are set.

* spot/gen/automata.cc, spot/gen/automata.hh: Define AUT_L_NBA.
* bin/genaut.cc (--l-nba): New option.
* bin/man/genaut.x, doc/org/genaut.org, NEWS: Document it.
* tests/python/gen.py, tests/core/genaut.test: Test it.

* spot/gen/automata.hh (aut_pattern): Add the dict argument.
* spot/gen/automata.cc, python/spot/gen.i: Adjust.
* tests/python/gen.py: Make sure two automata built without
specifying any dictionary share the same one.

* spot/gen/automata.hh, spot/gen/automata.cc: Hide ks_cobuchi() behind
introduce aut_pattern(), as we have already done for the formulas.
* bin/genaut.cc: Simplify using this interface.
* python/spot/gen.i: Introduce aut_patterns().
* tests/python/gen.ipynb, tests/python/gen.py: Adjust.

This helps with autocompletion in IPython, and it will prevent us from
mixing LTL patterns with automata patterns (once we have more than one
automata generator).

* spot/gen/formulas.hh: Here.
* spot/gen/formulas.cc, bin/genltl.cc, tests/python/gen.ipynb,
tests/python/gen.py: Adjust.

* spot/gen/formulas.hh, spot/gen/formulas.cc (genltl): Rename as...
(ltl_pattern): This.
(ltl_pattern_max): New function.
* bin/genltl.cc: Adjust names, and simplify using ltl_pattern_max().
* python/spot/gen.i (ltl_patterns): New function.
* tests/python/gen.py: Test it.
* tests/python/gen.ipynb: New file to document the spot.gen package.
* tests/Makefile.am, doc/org/tut.org: Add gen.ipynb.

Fixes #254.

* spot/gen/formulas.cc, spot/gen/formulas.hh: New files.
* spot/gen/Makefile.am: Add them.
* spot/Makefile.am: Fix build order.
* bin/genltl.cc: Move most code to the above files and adjust.
* bin/Makefile.am: Link genltl with libspotgen.
* doc/org/arch.tex: Adjust picture to show that genltl uses
libspotgen.
* python/spot/gen.i: Include formulas.hh.
* tests/python/gen.py: Make sure genltl() and ltl_pattern_name()
can be called.

* spot/gen/automata.cc: implement the change.

* spot/gen/automata.hh: State the precondition.
* spot/gen/automata.cc: Catch n==0.
* tests/core/genaut.test: Test it.

This library, called libspotgen, gathers functions to generate classes
of automata found in the literature.
Related to #254.

* NEWS, README: Mention the modification.
* Makefile.am, debian/control, debian/libspotgen0.install: Build the new
  library in a separate package.
* spot/gen/automata.hh, spot/gen/automata.cc: Add a family of co-Büchi
  automata.
* configure.ac, spot/Makefile.am, spot/gen/Makefile.am: Build the new
  library.