schemas/functions.sql: Removed duplicate previous version of _and() with fewer parameters

Regenerated vegbien.ERD exports

schemas/vegbien.sql: method: Made reference_id NOT NULL so the method table would automatically be datasource-scoped

mappings/VegCore-VegBIEN.csv: Renamed creator_ids to reference_id since they are now fkeys to reference

schemas/vegbien.sql: Made creator_ids an fkey to reference instead of party, so that datasources are stored separately from people and to allow adding reference-type metadata (URL, copyright, etc.) for each datasource

schemas/vegbien.sql: reference: Added unique index

mappings/VegCore-VegBIEN.csv: Remapped accordingTo to taxonconcept.concept_reference_id

mappings/VegCore-VegBIEN.csv: Don't populate taxonlabel.creator_id using identifiedBy, because that was meant for creating a taxonconcept when the accordingTo was not specified, but taxonconcepts are now modeled differently using a taxonconcept subclass of taxonlabel with a concept_reference_id

schemas/vegbien.sql: taxonverbatim: Renamed binomial to taxonname because this field is actually the taxonomic name without the author, not just the genus+specific epithet binomial

mappings/VegCore.csv: Renamed *Binomial to *TaxonName because this field can store more ranks than just the genus+specificEpithet binomial (that goes in speciesBinomial)