import_mothur_constaxonomy(mothur_constaxonomy_file,
parseFunction = parse_taxonomy_default)parse_taxonomy_default for an example. If the default is
used, this function expects a semi-colon delimited taxonomy string, with
no additional rank specifier. A common taxonomic database is GreenGenes,
and for recent versions its taxonomy includes a prefix, which is best cleaved
and used to precisely label the ranks (parse_taxonomy_greengenes).taxonomyTable-class object.import_mothur