Algorithms directory tree for tests

- graphs: graphs algorithms
- labeled_graphs: labeled graphs (discard label)
- label_aware_graphs: labeled graphs (with consideration of label)
- freemonoid_labeled_graphs: labeled graphs where labels are on K<<A*>>
- letter_combination_labeled_graphs: labeled graphs where labels are
linear combination of letters
- boolean_automata: Boolean automata
- series_multiplicity_transducers: Transducers over P(B*)
- fmp_transducers: Free monoid product transducers
- pair_automata: Automata over monoids with `pair' letter type.
