Updated Taxon.set_iconic_taxon_for_observations_of to use a single query.
Prevented proj obs field dialog after adding to proj when all fields already filled out.
Added icon for map overlay control.
Bugfix: iconic taxon update was broken when iconic taxon id was nil.
Place-specific life lists.
Include taxon common name in obs/index.json.
Documented X header pagination info in obs/index.json response.