twa_graph: more test coverage
The goal is to improve coverage stats, but I discovered two issues while doing so. * tests/python/twagraph.py: New test case. * tests/Makefile.am: Add it. * spot/twa/twagraph.hh: Add fix typos in error messages. * python/spot/impl.i: Fix broken wrappers for state_from_number and state_acc_sets.
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