strength: fix is_terminal()
Fix #198. Reported by Maximilien Colange. * spot/twaalgos/strength.cc (is_terminal): Test that no accepting transition lead to a rejecting SCC. * tests/core/strength.test: Add test case. * spot/twaalgos/strength.hh, spot/twa/twa.hh, doc/org/concepts.org: Adjust documentation. * NEWS: Mention the fix.
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