Create ITS OTU-Taxon linker

[skmorgane]

• If Check ITS Taxon data #5 suggests ITS ids ok, then in OTU-Taxon linker file, those IDs should be marked as "consensus" ids

• If Check ITS Taxon data #5 suggests that we need to do our own work on taxon matching, BLAST all "known" OTUs to extract match data to create our own consensus IDs

• Add the results from BLASTing the "no BLAST" OTUs, decide if we can create consensus IDS from those and what level of confidence we have in those results