is_weak_scc and friend: make them work for alternating automata
* spot/twaalgos/isweakscc.cc, spot/twaalgos/isweakscc.hh, spot/twaalgos/mask.cc, spot/twaalgos/mask.hh: Adjust to work with alternating automata. * spot/twaalgos/sccinfo.cc, spot/twaalgos/sccinfo.hh (determine_unknown_acceptance): Do not complain about not supporting alternating automata if there is not indeterminate acceptance. * spot/twaalgos/stats.cc: Fix a bug were %[iw]c was read as %[iww]c. * tests/core/alternating.test: Test is_inherently_weak_scc() and is_weak_scc(). * python/spot/impl.i: Add missing python bindings for isweakscc.hh.
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