dot: display acceptance names
* spot/twaalgos/dot.cc: Display common acceptance names.
* NEWS: Mention the change.
* doc/org/oaut.org: Adjust text.
* tests/core/alternating.test, tests/core/readsave.test,
tests/python/_altscc.ipynb, tests/python/alternation.ipynb,
tests/python/atva16-fig2a.ipynb, tests/python/atva16-fig2b.ipynb,
tests/python/automata.ipynb, tests/python/decompose.ipynb,
tests/python/gen.ipynb, tests/python/highlighting.ipynb,
tests/python/product.ipynb, tests/python/randaut.ipynb: Adjust test
cases.
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