added bktree.ml
Merge remote-tracking branch 'origin/master' into bktree
added mli; made make_tree_exn work
added search
bktree seems to work
Reworked barcode to reference (simpler)
fully utilize BK-tree for approximate string matching of row barcodes
Merge pull request #1 from mtomko/bktree

Use BK-tree for approximate string matching of row barcodes