bugfix: lib/runscripts/file.pg.sql.run: export_(): exclude Source and related tables so that these will be re-created by the staging tables installation instead, ensuring that they are always in sync with the Source/ subdir

bugfix: schemas/vegbien.sql: analytical_stem_view: scrubbed_taxon_name_no_author, scrubbed_author: need to COALESCE these to the matched* when no accepted* is available

schemas/vegbien.sql: analytical_stem_view, etc.: renamed scrubbed fields with the scrubbed_* prefix, to clearly distinguish these from the equivalent fields for other taxon names

bugfix: schemas/vegbien.sql: analytical_stem_view: family, genus: need to COALESCE these to the matched* when no accepted* is available

backups/TNRS.backup.md5: updated

inputs/.TNRS/schema.sql: removed no longer used score_ok(). use tnrs.Is_plant instead. (the threshold is still documented in tnrs_populate_fields().)

inputs/.TNRS/schema.sql: tnrs_populate_fields(): is_valid_match: don't consider Max_score because Is_plant will always be false when the Max_score is insufficient (<0.8)

inputs/.TNRS/schema.sql: schema comment: added steps to remake schema.sql and back up the new TNRS schema. documented that these steps should be run on vegbiendev.

inputs/.TNRS/schema.sql: schema comment: added steps to determine what changes need to be made on vegbiendev

inputs/.TNRS/schema.sql: tnrs_populate_fields(): regenerate the derived cols: updated runtimes (~same)