Use doApproximateMatching when bulk mapping OTUs
Use doApproximateMatching when bulk mapping OTUs

Setting this flag to false (supported in the latest taxomachine/master)
makes bulk mapping go much faster. I'm keeping the careful tests for
exact matches in the AJAX callback, for use in later single-taxon mapping.

OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree