schemas/vegbien.sql: Added _km_to_m()

schemas/vegbien.sql: Added _km_to_m()

schemas/vegbien.sql: place: Added georeference_valid, distance_to_country_m, distance_to_state_m

mappings/VegCore-VegBIEN.csv: matched taxonlabel's ancestors: Only create the cross links to NCBI if the name is accepted (taxonIsCanonical)

mappings/VegCore-VegBIEN.csv: accepted* taxonomic terms: If is canonical name, don't populate a separate accepted taxonlabel because the taxonlabel itself is accepted. If is not canonical name, populate matched_label_id directly when the row is created instead of waiting until after all rows are created and using _taxonlabel_set_matched_label_id(). This is possible now that accepted taxonlabels occur only in TNRS's tnrs_accepted table, which is specially marked as taxonIsCanonical. Avoiding _taxonlabel_set_matched_label_id() should fix the slowdown that occurs when it's used on large tables.

mappings/VegCore-VegBIEN.csv: taxonIsCanonical: Moved then=0 into non-identifying _if statement attributes

mappings/VegCore-VegBIEN.csv: Mapped taxonIsCanonical

bin/map: map_rows(): map_table(): Fixed bug where metadata values were being removed prematurely, by passing them through

bin/map: map_rows(): Fixed bug where metadata values were being passed to functions that expected columns, by placing them directly in the XML import tree and then removing them from the mappings

input.Makefile: Maps validation: %/new_terms.csv: Filter out metadata values, which are not new terms even though they are in the same map column as the input columns