autfilt: fix --accept-word
* bin/autfilt.cc: Translate each word as an automaton once, and do not make a global product of all of them. * spot/twaalgos/word.cc: Register the atomic propositions used by the word when converting it into an automaton. * tests/core/acc_word.test: Add a test case that used to fail, and another test that make sure some words are not accepted.
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