decompose_strength: work with inherently weak SCCs
* wrap/python/tests/decompose.ipynb: Adjust text. * spot/twaalgos/strength.hh, spot/twaalgos/strength.cc: Adjust to extract inherently weak SCCs instead of weak SCCs. This gets rids of the special handling for the "corner cases". * spot/tests/strength.test: Adjust. * NEWS: Mention it.
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