bugfix: schemas/util.sql: mk_drop_from_create(): only match CREATE if no custom DROP came before it

bugfix: schemas/public_.sql: sync_geoscrub_input_to_view(): `CREATE TABLE geoscrub_input AS __`: needs `LIMIT 0`

fix: schemas/util.sql: explain2notice_msg_if_can(): also need to catch invalid_cursor_definition ("cannot open multi-query plan as cursor")

schemas/public_.sql: sync_analytical_stem_to_view(): removed DROP TABLE IF EXISTS because this is now done automatically by util.recreate()

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