inputs/test_taxonomic_names/test_scrub: don't need to run the import twice anymore because the accepted names are now included in the tnrs_input_name view that TNRS runs on

inputs/test_taxonomic_names/test_scrub: updated for current TNRS schema

bugfix: inputs/test_taxonomic_names/test_scrub: unset $n so it doesn't limit the # rows. it is set to 2 in the default test environment, so must be unset for n-sensitive programs that should be unlimited.

inputs/test_taxonomic_names/test_scrub: updated for current TNRS schema

inputs/GBIF/raw_occurrence_record/run: herbaria_filter.table/make(): also include the exported plant_fraction herbaria

inputs/GBIF/raw_occurrence_record/run: added herbaria_filter.plant_fraction.csv_/make(), which exports the plant_fraction herbaria whose plant_fraction >= 0.8

inputs/GBIF/raw_occurrence_record/run: added plant_fraction.table/make(), which contains the plant fraction for each herbarium

lib/sh/db.sh: added mk_drop()

lib/sh/util.sh: to_file(): log $stdout so users can tell which file is being created by the command. for some reason, can't use `local redirs=(">$stdout")` because the redirections don't seem to be applied. can't yet use `log+ -2 echo_vars stdout` because log+ does not yet support negative adjustments (they cause PS4 to be emptied out before being re-prepended to).

bugfix: lib/sh/util.sh: log+(): adjustment < 0: need to enclose -$1 in $(()) so it gets evaluated before being used as an array index