schemas/util.sql: added copy()

schemas/util.sql: added copy_data()

fix: inputs/.TNRS/schema.sql: added back index on Name_submitted, which is needed for tnrs_input_name to work properly (now that there is no automatic index created by a unique constraint)

schemas/vegbien.sql: tnrs_input_name: don't scrub accepted names, as using multiple matches per name no longer provides a single accepted name to scrub. instead, the Accepted_* fields can be whitespace-split to generate the same columns that would have been generated by the scrubbing (and without the overhead of the extra TNRS call).

fix: inputs/.TNRS/schema.sql: tnrs: removed unique constraint on Name_submitted, Name_matched because there can be more than one match with the same Name_matched (but different accepted names, etc.)

fix: inputs/.TNRS/schema.sql: tnrs.tnrs__valid_match index: made it non-unique to allow multiple matches per name, as is needed to implement #917

bugfix: inputs/.TNRS/schema.sql: tnrs__match_num__fill(): only fill if not set, to support case where tnrs is being restored from a .sql file (where match_num is already set)

inputs/.TNRS/schema.sql: tnrs: documented runtime to add a constraint (3 min)

inputs/.TNRS/schema.sql: unique constraint on Name_submitted: added Name_matched to allow multiple matches per name, as is needed to implement #917

inputs/.TNRS/schema.sql: tnrs: documented how to populate a new column