subset option on functions like supertaxa.
Converts logical and taxon_ids into indexes of taxon_data.
format_taxon_subset(obj, index)taxmap)
The taxmap object containing taxon information to be queried.character, then it should be values of taxon_ids.
If a numeric, then it should be row indexes of taxon_data.
If a logical, then it should correspond to rows of taxon_data.numeric