Fixes #276. * spot/twaalgos/sbacc.cc, spot/twaalgos/degen.cc: Detect accepting sinks, and merge them. * tests/python/dualize.py: Adjust. * tests/python/sbacc.py: More test cases.
Fixes #274. * python/spot/impl.i: Bind sbacc(). * tests/python/sbacc.py: New tesat. * tests/Makefile.am: Add sbacc.py.