Removed non-existent field reference_id. Added uniqueness validation
[#49202187] Adds before_validation callback to ensure that common names are not duplicated. And to avoid propagating changes made to a common name to other taxon concepts' common names
[#49202187] And once again Agnieszka saves the day. Simplified method to assign common names, and fixed specs to match new design
[#49202187] Make sure taxon_common form works
Merge branch 'unique_common_names' into develop