mappings/DwC2-VegBIEN.specimens.csv, VegCSV-VegBIEN.specimens.csv: taxonoccurrence: Map everything except occurrenceID (which is globally unique) to new authortaxoncode, which only needs to be unique within the locationevent

schemas/vegbien.sql: taxonoccurrence: Renamed taxonoccurrence_locationevent_1_to_1 to taxonoccurrence_unique_within_locationevent and added new authortaxoncode to it

schemas/vegbien.sql: taxonoccurrence: Added authortaxoncode to store unique keys that are unique within the locationevent rather than within the datasource

inputs/SALVIAS-CSV/maps/VegCSV.organisms.csv: Added _alt to height_m, stem_height_m to choose between them when both are specified (rather than having bin/map choose their priority order based on their order in the map). Note that when both of the heights are specified, they are always either the same, or height_m is invalid (see <https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/SALVIAS_issues#Some-organisms-have-one-stem-but-different-heights-in-the-organisms-and-stems-tables&gt;).

bin/map: collision_suffix: Setting back to _alt to test if _merge caused the SpeciesLink slowdown. SpeciesLink contains a huge number of equivalent columns due to each DwC term being present with namespaces for all versions of the DwC schema, and these columns can be combined either using _alt or _merge. _merge is only useful if the values in different versions of the same DwC field are different, which is not likely the case.

inputs/import.stats.xls: Updated with stats from latest import. The import time for SpeciesLink (the slowest datasource) doubled, to 16 hours, most likely due to replacing _alt with the slower _merge, which preserves more input data.

mappings/DwC2-VegBIEN.specimens.csv, VegCSV-VegBIEN.specimens.csv: occurrenceID: Mapped to location.authorlocationcode instead of sourceaccessioncode so that it would not override any location- or event-related IDs in location.authorlocationcode merely by being mapped to the sourceaccessioncode field (which takes precedence over the authorlocationcode when specified)

mappings/VegCSV-VegBIEN.specimens.csv: occurrenceID: Mapped to specimenreplicate.sourceaccessioncode for mergability with DwC

mappings/VegCSV-VegBIEN.specimens.csv: Mapped voucherType to indirect voucher _if statements' conditions

mappings/VegCSV-VegBIEN.specimens.csv: locationID: location.sourceaccessioncode mapping: Added /_alt suffix for mergability with DwC