sccinfo: adjust to work with alternating automata
* spot/twaalgos/sccinfo.cc: Consider universal edges as if they were existential edges. * spot/twaalgos/sccinfo.hh: Document that. * spot/twaalgos/dot.cc: Allow option 's' again, for easy testing. * tests/core/alternating.test: Adjust tests. * tests/python/_altscc.ipynb: New file (more tests). * tests/Makefile.am: Add it.
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