xml_func.py: simplify(): Run xml_dom.prune_empty() on function nodes that don't have an explicit simplifying function. This allows single-arg functions with no arg to be pruned rather than called with no args (causing errors if the single param does not have a default value).

Regenerated vegbien.ERD exports

schemas/vegbien.sql: Added units suffix to additional VegBIEN fields that have units

schemas/vegbien.sql: Added units suffix to all core VegBIEN fields that have units. It is the responsibility of the mappings to ensure that all units are properly translated.

root Makefile: PostgreSQL: postgres-Linux: Added postgresql-postgis apt-get

backups/Makefile: Backups: Full DB: Specify the date suffix of the backup when it's created rather than adding it afterwards. This allows the user to specify a suffix that matches the corresponding public-schema backup.

inputs/*/*/map.csv: Mapped variants of subspecies directly to new subspecies term

mappings/VegCore-VegBIEN.csv: subspecies, infraspecificEpithet: Added _alts for datasources that specify both

input.Makefile: Mapping: $(map2db): Inline $(map) because this is the only place it's used

input.Makefile: Mapping: $(map): Don't require flat files because they don't need to be used directly anymore (staging tables are used instead)