schemas/vegbien.sql: method: method_unique: Added reference_id to make method unique within the datasource instead of globally unique within VegBIEN

mappings/VegCore.csv: Added samplingProtocolID

mappings/VegCore-VegBIEN.csv: subplot locationevent: Only populate parent locationevent's location unique IDs if a subplot #/subplotID is actually specified. (The lack of a location unique ID will cause the parent locationevent's location to be removed, as well as the parent locationevent itself if there is no parent locationevent unique ID.) This fixes a bug where top-level plots in datasources that provide a nullable subplot #/subplotID were incorrectly getting connected to parent locationevents.

mappings/verify.plots.sql: Added # locations, # location events, which also include subplots

inputs/SALVIAS/verify/plots.ref.sql: Standardized line wrapping to put ; on its own line in multi-line queries and at the end of the line in one-line queries

mappings/verify.plots.sql: Added "top-level" to # locations, # location events names because these queries do not include all locations

inputs/SALVIAS/verify/plots.ref.sql: # locations: Fixed count to include all plotMetadata entries instead of just unique coordinates, because each plotMetadata entry now gets its own location

mappings/VegCore-VegBIEN.csv: matched place: When any of the accepted* names is specified, set matched_place_id=0 (self-reference) to indicate that the matched place is an accepted (scrubbed) place

schemas/vegbien.sql: analytical_stem_view: Use the canonical (scrubbed) place instead of the datasource's place where available. Note that canon_place_id is always populated (with a self-reference if needed), to enable using a just a LEFT JOIN for this.

schemas/vegbien.sql: analytical_stem_view: Use datasource_* prefix instead of reference_* prefix that tables had gotten when datasource_id was renamed to reference_id