genem: implement a generic emptiness check for twa_graph_ptr
* spot/twa/acc.cc, spot/twa/acc.hh (fin_unit, one_fin): New function. * spot/twaalgos/genem.cc, spot/twaalgos/genem.hh: New files. * spot/twaalgos/Makefile.am: Add it. * tests/python/genem.py: New file. * tests/Makefile.am: Add it. * python/spot/impl.i: Add bindings for genem.hh. * NEWS: Mention the new function.
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spot/twaalgos/genem.cc
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spot/twaalgos/genem.hh
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tests/python/genem.py
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