schemas/VegCore/VegCore.ERD.mwb: replaced trait table with traits hstore on taxon_occurrence, since the trait table is basically just a way of allowing the user to add arbitrary measurement columns to the taxon_occurrence. units can be indicated by storing a record with the quantity and units, converted to a string, and parsing it back out as a record upon retrieval.
schemas/VegCore/VegCore.ERD.mwb: replaced trait table with traits hstore on taxon_occurrence, since the trait table is basically just a way of allowing the user to add arbitrary measurement columns to the taxon_occurrence. units can be indicated by storing a record with the quantity and units, converted to a string, and parsing it back out as a record upon retrieval.