Speed up computation of non_final states for minimize_wdba.
* src/tgbaalgos/minimize.cc (minimize_dfa): Take final and non_final sets. (minimize_wdba): Fill in non_final at the same time as final. (minimize_monitor): Call state_set() to fill non_final. (init_sets): Simplify and rename as ... (state_set): ... this.
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