* 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.