Split a LTL formula to a set of formula that don't share
output proposition. It allows to create multiple
strategies in ltlsynt.
* spot/twaalgos/synthesis.cc,
spot/twaalgos/synthesis.hh: here
* doc/spot.bib: Add reference
* spot/twaalgos/simulation.hh, spot/twaalgos/simulation.cc: Add
reduce_direct_sim(), reduce_direct_cosim() and
reduce_direct_iterated() wich reduce an automaton using simulation.
This functions wrap the class direct_sim wich compute simulation
with a new method.
* doc/spot.bib: Add ref.
* tests/python/simstate.py: Add tests for the new simulation.
* spot/twaalgos/toparity.hh: Improve doc, and rename car_option into
to_parity_options.
* doc/spot.bib: Add one reference.
* python/spot/__init__.py, spot/twaalgos/toparity.cc,
tests/python/toparity.py: Adjust.
