NikolaiHampton 2c50dd0c59 Memory efficient implemenation of Levenshtein Distance for radiff2 (add -V)
Implemented the iterative two matrix row version from here: https://en.wikipedia.org/wiki/Levenshtein_distance
and here: http://www.codeproject.com/Articles/13525/Fast-memory-efficient-Levenshtein-algorithm

Memory usage was originally 200Gig for a couple of 100K files ~(sizeA*sizeB), now about ~(sizeB*2)...
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