game: rewrite, document, and rename solve_reachability_game
* spot/twaalgos/game.hh, spot/twaalgos/game.cc: Rename solve_reachability_game() as solve_safety_game(), rewrite it (the old implementation incorrectly marked dead states as winning for their owner). * tests/python/paritygame.ipynb: Rename as... * tests/python/games.ipynb: ... this, and illustrate solve_safety_game(). * tests/Makefile.am, NEWS, doc/org/tut.org: Adjust. * tests/python/except.py: Add more tests.
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