polish previous two patches
* NEWS: Update. * spot/twaalgos/genem.cc, spot/twaalgos/genem.hh, spot/twa/twa.cc: Update copyright years. * spot/twa/twa.hh: Update Doxygen documentation. * spot/twaalgos/sccinfo.cc, spot/twaalgos/sccinfo.hh: Simplify data structures, and fix failure of get_accepting_run() to compute accepting runs in SCC that are accepting due to the self-loop optimization of scc_info. * tests/python/highlighting.ipynb: Add three test cases.
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