schemas/vegbien.sql: party: Fixed bug where needed separate unique index for roots (datasources), whose organizationnames must be globally unique rather than unique within a datasource

schemas/vegbien.sql: taxonconcept: Renamed concept_reference_id to definer_id because this is a clearer name and because this will allow merging with datasource_id, which serves the same purpose

schemas/vegbien.sql: party: Made it datasource-scoped. Since this creates a recursive fkey, a datasource (a root party) should point to itself in this field, which will happen automatically by setting it to the special value 0.

lib/PostgreSQL-MySQL.csv: Changed translation of fulltext to quote the identifier instead of appending characters to make it not a reserved word

schemas/vegbien.sql: taxonconcept: Moved concept_reference_id to the top of the table because it is now a key scoping field

schemas/vegbien.sql: concept_reference_id: Made it an fkey to party instead of taxonscope, because this is now the entity that defined the taxon concept, and is no longer specific to morphospecies. Removed no longer used table taxonscope.

schemas/vegbien.sql: taxonconcept: Documented that it's equivalent to VegBank's plantConcept table

schemas/filter_ERD.csv: taxonconcept inward fkeys: Removed not applicable taxon filtered table, since the fkey points in the opposite direction and thus is not part of this filter

schemas/vegbien.sql: taxonconcept: Renamed scope_id -> concept_reference_id as part of taxonomic schema refactoring at <https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/2012-10-03_conference_call#Taxonomic-schema-refactoring>

README.TXT: Schema changes: Moved "update the following files with any renamings" out of "Sync ERD with vegbien.sql schema" because this is needed for any schema changes, not just as part of syncing the ERD