honor ap() when counting transitions
Fixing this bug alone revealed another bug: parsing never claim or LBTT automata did not register APs. So this fixes both bugs. This is the first part of #170. * spot/twa/twa.hh (register_aps_from_dict): New method. * spot/parseaut/parseaut.yy: Call it for never claim and LBTT files. * spot/twaalgos/stats.cc: Simplify using ap_vars(). * tests/core/ltl2tgba.test: Add a test case. * NEWS: Mention the bugs.
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