fix: schemas/public_.sql: sync_*(): use util.copy() instead of CREATE TABLE AS so that table and column comments are also copied. this avoids the need to separately add the same comments to the view and its materialized table.

bugfix: schemas/util.sql: recreate(): need to handle case where util.mk_drop_from_create() is NULL

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: lib/tnrs.py: Constrain by Source: turn it on so that the download settings reflect what TNRS actually used, while this is broken

fix: lib/tnrs.py: max_names: reduced back to 500 because even 5000 crashes the dev TNRS server