Add tree label-synchronous beam-search algorithm #129
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This adds a label-synchronous search algorithm on a search tree built by the AedTreeBuilder (#127).
It is derived from the lexicon-free label-synchronous beam-search algorithm (#126). Similar to the time-synchronous treesearch (#113), global or separate pruning of within-word and word-end hypotheses (within the set of active hypotheses) is possible and a language model score is added a word end.