Make it easier to convert acc-conditions to associated formulae.
This is motivated by the fact that sog-its used the low-level data structures used by the bdd_dict to do such work, and broke because of the recent changes in this area. * src/tgba/bdddict.cc, src/tgba/bdddict.hh (oneacc_to_formula): New method. * src/tgbaalgos/save.cc: Use it.
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