We do not remove them in rejecting SCCs (as it might make the SCC
accepting), but we can remove them between SCCs.
Fixes#101.
* src/twaalgos/sccfilter.cc: Here.
* src/tests/sccsimpl.test: Add test case.
* NEWS: Mention this.
* src/twaalgos/sccfilter.cc (acc_filter_some, acc_filter_all): Merge
into...
(acc_filter_mask): ... this single parametrized class, and only
remove sets that are only used as Inf.
* src/twa/acc.hh: Add missing operator~.
* src/tests/sccsimpl.test: Add test case.
* src/tests/sccdot.test: Adjust.
* NEWS: Mention the bug.
* src/twaalgos/sccinfo.cc, src/twaalgos/sccinfo.hh
(determine_unknown_acceptance): New function to call explicitly
in case one want to know whether the accepting/rejecting status
of all SCCs regardless of the acceptance.
* src/twaalgos/dotty.cc src/twaalgos/sccfilter.cc,
src/twaalgos/sccfilter.hh: Use it.
* src/tests/unambig.test, src/tests/sccdot.test: Add more tests.
* doc/org/oaut.org: Adjust doc for --dot=s, orange is not output
anymore.
Note however that scc_info does not provide a precise accept/reject
characterization for SCCs when using Fin acceptance. However whenever
it tells that an SCC is rejecting, scc_filter_states() may safely remove
it.
* src/twaalgos/sccfilter.cc (scc_filter_states): Allow on any TωA.
(scc_filter): Only use acceptance simplifications on TGBA.
* src/tests/unambig.test: Add a co-Büchi test.
