simplify_acc: loop over the simplifications
* spot/twaalgos/cleanacc.cc (simplify_acceptance_here): Run the simplifications in a loop until the condition does not change anymore. * tests/python/simplacc.py, tests/core/accsimpl.test, tests/core/remfin.test, tests/python/merge.py, tests/python/simplacc.py, tests/python/toparity.py: Update expected results. * tests/python/automata.ipynb: Update the failing example to a more interesting one, matching the one in doc/org/autfilt.org.
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