alternation: add a states_and algorithm
This should will come handy to implement the convertion from LTL to alternating automata, and to handle automata with multiple initial states. * spot/twaalgos/alternation.hh, spot/twaalgos/alternation.cc: New files. * spot/twaalgos/Makefile.am: Add them. * python/spot/impl.i: Add bindings. * tests/python/alternating.py: Test states_and.
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