schemas/vegbien.sql: taxonlabel_update_ancestors(): Include ancestors for both parent_id and matched_label_id rather than just one or the other. This avoids needing to delete existing ancestors for the parent_id when a matched_label_id is added and overrides it. This should reduce the TNRS import time if the slowdown was due to the need to delete parent_id ancestors when later adding a matched_label_id (which only occurs in a separate step in the TNRS datasource).