Clément Gillard authored Dec 11, 2018 and Alexandre Duret-Lutz committed Feb 14, 2019

Implement an accepting run search in spot::sccinfo, use it with the
generic emptiness check.

* spot/twaalgos/sccinfo.cc, spot/twaalgos/sccinfo.hh: Here.
* spot/twaalgos/genem.cc, spot/twaalgos/genem.hh: Use it.
* tests/python/genem.py: Test it.