* spot/twaalgos/cleanacc.cc (remove_compl_rec): Rewrite to preserve
the original order of the acceptance condition while rewriting it.
* tests/core/sccdot.test, tests/python/merge.py,
tests/python/simplacc.py, tests/python/toparity.py: Adjust test cases.
* 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.
* spot/twaalgos/cleanacc.cc (fuse_mark_here): Fix incorrect cancelling
of n-ary subterms, causing an invalid acceptance condition, and then
an infinite loop.
* tests/python/simplacc.py: Add test case.
Reported by Florian Renkin.
* spot/twaalgos/cleanacc.cc: Do not rewrite
...Fin(0)&(Fin(1)|(Fin(3)&Inf(4)))... as Fin(0)&f when it appears that
{1,3} cannot receive {0}, because {1} is used elsewhere in the
acceptance.
* tests/python/simplacc.py: Add test case.
