mappings/VegX-VegCSV.stems.csv: Changed plantObservation.sourceAccessionCode to individualOrganismObservation.uniqueID, to be consistent with VegX names. (*source*AccessionCode only applies to an aggregate DB that preserves info from its inputs. accessionCode made less sense, because this field is for the datasource's primary key, which it may or may not consider an accession code.)
mappings/VegX-VegCSV.stems.csv: Changed plantObservation.sourceAccessionCode to individualOrganismObservation.uniqueID, to be consistent with VegX names. (*source*AccessionCode only applies to an aggregate DB that preserves info from its inputs. accessionCode made less sense, because this field is for the datasource's primary key, which it may or may not consider an accession code.)