Hybrid rank name

This amends the code in both taxon_concept_observer and the overnight script to properly set the rank_name (in taxon_concepts.data, as that will propagate to taxon_concepts_mview.rank_name)

for best results:
select * from rebuild_taxonomy()
select * from rebuild_taxon_concepts_mview()

NOTE: this is part of making hybrids searchable, experimenting with smaller PR sizes