mark_t: sets() no longer returns a vector
spot::mark_t::sets() was modified so that it now returns an iterable object rather than an std::vector<unsigned>. * NEWS: Mention the modification. * python/spot/impl.i: Declares mark_container as iterable to SWIG. * spot/parseaut/parseaut.yy: Adapts to the modification. * spot/twa/acc.hh: Implement the modification. * tests/python/acc_cond.ipynb: Adapts to the modification.
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