Non recursive impl with indicies#7

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de-code wants to merge 11 commits into

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de-code:non-recursive-impl-with-indicies

Commits on May 5, 2017

added unit tests
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added alternative non-recursive smith waterman implementation
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merged from upstream
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Commits on May 6, 2017

fixed overly greedy algorithm
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use original computeAlignmentMatrix
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combine max call
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Commits on May 7, 2017

convert to depth first traceback
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convert traceback to generator
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go left and up if the scores are the same (and are better than going diagonally)
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introduced limit
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Commits on May 8, 2017

reversed unintended change to SimpleScoring
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