overhaul the stutter-invariance checks
* spot/twaalgos/stutter.cc, spot/twaalgos/stutter.hh: Cleanup and document the api. * spot/twa/twa.hh, doc/mainpage.dox: Add a stutter-invariant section. * tests/python/stutter-inv-states.ipynb: Rename as ... * tests/python/stutter-inv.ipynb: ... this, and add more comments. * tests/Makefile.am, doc/org/tut.org: Adjust renaming. * bench/stutter/stutter_invariance_randomgraph.cc, bench/stutter/stutter_invariance_formulas.cc, bench/stutter/Makefile.am: Make it compile again. * bin/autfilt.cc: Call inplace variants. * NEWS: Mention the overhaul.
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