inputs/.TNRS/schema.sql: tnrs: removed no longer used tnrs_score_ok index. use tnrs__valid_match instead.

bugfix: inputs/.TNRS/schema.sql: tnrs_populate_fields(): is_valid_match: documented that this excludes homonyms because these are not valid matches (i.e. TNRS provides a name, but the name is not meaningful because it is not unambiguous)

bugfix: inputs/.TNRS/schema.sql: ValidMatchedTaxon: exclude inter-kingdom homonyms because these are not valid matches (i.e. TNRS provides a name, but the name is not meaningful because it is not unambiguous). this uses taxon_scrub__is_valid_match instead of score_ok() to determine whether the result should be included.

inputs/.TNRS/schema.sql: ValidMatchedTaxon: synced to MatchedTaxon

inputs/.TNRS/schema.sql: MatchedTaxon: added is_valid_match

inputs/.TNRS/schema.sql: tnrs: added tnrs__valid_match index to facilitate joining to only valid matches

inputs/.TNRS/schema.sql: tnrs: added is_valid_match derived column, to make it easier to select from only those TNRS results that can safely be used as a scrubbed name

lib/sh/util.sh: already_exists_msg(): added instructions on how to force-remake when the file already exists (prepend `rm=1` to the command)

inputs/VegBank/^taxon_observation.**.sample/test.xml.ref: updated inserted row count, now that CVS plots have been removed

bugfix: lib/runscripts/view.run: don't do anything in load_data(), to avoid trying to remake header.csv before the view is created. (for views, this instead happens in postprocess().)