twa_graph: add support for universal initial states
The only missing point is that the HOA parser cannot deal with multiple universal initial states, as seen in parseaut.test. * spot/graph/graph.hh (new_univ_dests): New function, extracted from... (new_univ_edge): ... this one. * spot/twa/twagraph.hh (set_univ_init_state): Implement using new_univ_dests. * spot/twaalgos/dot.cc, spot/twaalgos/hoa.cc, python/spot/impl.i: Add support for universal initial states. * spot/parseaut/parseaut.yy: Add preliminary support for universal initial states. Multiple universal initial states are still not supported. * tests/core/alternating.test, tests/core/parseaut.test, tests/python/alternating.py: Adjust tests and exercise this new feature.
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