Use tgba_explicit_numbered to create SCC-filtered automata.
* src/tgbaalgos/sccfilter.cc: tgba_explicit_numbered replace tgba_explicit_string for the general case. This way we don't have to prefix the result of format_state() in case to states have the same description. We just number the states instead. For the specific cases where the input automata are instance of tgba_explicit_string or tgba_explicit_formula, we clone the label.
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