acc: Add operators == and != for acc_code
and make sure are_isomorphic does not look only at the number of acceptance sets * src/tgba/acc.hh: Here. * src/tgbaalgos/are_isomorphic.cc: Use it to ensure two automata have the same acceptance condition. * src/tgbatest/explpro4.test: Test product between Büchi and co-Büchi, and make sure the isomorphic check look at the acceptance condition.
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