-- Though not intended, it was possible to create reference graphs with cycles in the case where you started the graph with a homopolymer of length > the kmer. The previous test would fail to catch this case. Now its not possible
-- Lots of code cleanup and refactoring in this push. Split the monolithic createGraphFromSequences into simple calls to addReferenceKmersToGraph and addReadKmersToGraph which themselves share lower level functions like addKmerPairFromSeqToGraph.
-- Fix performance problem with reduced reads and the HC, where we were calling add kmer pair for each count in the reduced read, instead of just calling it once with a multiplicity of count.
-- Refactor addKmersToGraph() to use things like addOrUpdateEdge, now the code is very clear
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