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.

NEWS

@@ -59,6 +59,9 @@ New in spot 2.3.5.dev (not yet released)
     the Python bindings can be found at
     https://spot.lrde.epita.fr/ipynb/decompose.html
 
+  - The print_dot() function will now display names for well known
+    acceptance conditions under the formula when option 'a' is used.
+
   - A new named property for automata called "original-states" can be
     used to record the origin of a state before transformation.  It is
     currently defined by the degeneralization algorithms, and by