validation/aggregating/plots/bien3_validations_salvias_vegbien.sql: _plots_21_tnrs_output_names: removed no longer needed setting of join_collapse_limit (the column now used does not involve an additional join)

schemas/vegbien.sql: _plots_21_tnrs_output_names: use scrubbed_unique_taxon_name (concatenated output name) because this is more similar to the concatenated name used in _plots_20_tnrs_input_names

bugfix: validation/aggregating/plots/bien3_validations_salvias_vegbien.sql: _plots_21_tnrs_output_names: needs to be run with `SET join_collapse_limit = DEFAULT; SET enable_hashjoin = off;` to produce the right query plan

fix: lib/util.py: dict_subset(): raise an error if collections.OrderedDict isn't available, because some callers may depend on this. note that using dict instead of OrderedDict may be the cause of the joining on the wrong columns bug (issue #902).

validation/aggregating/plots/bien3_validations_salvias_vegbien.sql: updated to DB

bugfix: schemas/public_.sql: _plots_21_tnrs_output_names: need to use TNRS output rather than input name

schemas/public_.sql: added _plots_20_tnrs_input_names, _plots_21_tnrs_output_names

schemas/public_.sql: public_validations: schema comment: documented how to run just the output queries on a particular datasource

fix: schemas/public_.sql: rm_all_queries(): also remove output-only result tables

schemas/public_.sql: query_view_regexp(): also match auxiliary tables