parseaut: preliminary support for reading alternating automata
Currently this only reads universal branches. The parser (and the automaton code) do not support universal initial states. * spot/parseaut/parseaut.yy: Read universal branches. Deal with the no-univ-branch/!univ-branch change in HOA 1.1. * tests/python/alternating.py: Read the output of print_hoa. * tests/core/parseaut.test: Adjust test output, and add more tests.
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