mappings/VegCore-VegBIEN.csv: Mapped morphospecies

mappings/VegCore.csv: Added morphospecies

schemas/vegbien.sql: taxonpath: Added morphospecies

inputs/.TNRS/tnrs/test.xml.ref: Updated for latest TNRS output

inputs/.TNRS/tnrs/map.csv: Infraspecific_rank_2, Infraspecific_epithet_2_*: Mapped to UNUSED because they do not appear to be provided by TNRS (it just puts additional infraspecific names in Unmatched_terms)

inputs/.TNRS/tnrs/map.csv: Omit Infraspecific_rank because Name_matched_rank contains the unabbreviated rank and is provided more often

mappings/VegCore-VegBIEN.csv: Also map TNRS-parsed infraspecificEpithet (Infraspecific_epithet_matched) to taxon at the infraspecies rank

mappings/VegCore-VegBIEN.csv: Also map TNRS-parsed taxonomic ranks to the tree of life in the taxon table

schemas/vegbien.sql: taxon: Added comment that this table stores the tree of life

mappings/VegCore-VegBIEN.csv: accepted taxonomic terms: Use new _set_canon_taxonpath() to set the canon_taxonpath_id after the taxonpath has been inserted, so that if the taxonpath is an accepted name (scrubs to itself), it will link up to the just-inserted taxonpath with the taxonomic ranks parsed out, rather than to a new taxonpath containing only the few taxonomic ranks of the accepted name that TNRS provides. In particular, this (together with the tnrs_accepted_names sorting index on TNRS.tnrs) ensures that an accepted name is imported with its genus and species parsed out by TNRS instead of concatenated together in the Accepted_name_species field (genus+species). This enables the individual taxonomic ranks to be used in constructing the leaves of the tree of life (the taxon table).