Modified renaming of representative sequences to be faster. assoc.table rows in same order as representative sequences, so do not have to search for row to get renaming information; instead just copy from each row in assoc.table. Modified functions: assoc_repseq_IDs_with_otus_by clstr.R, assoc_repseq_IDs_with_otus_by_fasta.R, rename_fasta.R.