schemas/util.sql: rematerialize_view(): support updating just the table's schema, without populating it

schemas/util.sql: rematerialize_view(): don't need extra eval() around table_mod_sql because recreate() performs eval()

lib/sh/sync.sh: db_snapshot(): before backing up, trim bloated temp files (eg. from rolled back changes)

bugfix: inputs/.TNRS/schema.sql: taxon_match: use wrapper for util.remove_prefix() so CHECK constraints that use it don't get dropped when the util schema is reinstalled

schemas/public_.sql: *_view_modify(): use util.rematerialize_view(), which now supports table mods

schemas/util.sql: rematerialize_view(): added support for table mods to run after creating table

bugfix: schemas/util.sql: rematerialize_view(): don't populate unless recreate() can successfully recreate the dependent views, to avoid populating the entire table (which for some views can take hours) only to have the changes rolled back by a failing dependent view

schemas/util.sql: removed no longer used materialize_view(). use util.copy() instead.

schemas/util.sql: rematerialize_view(): call util.copy() directly instead of via util.materialize_view()

schemas/util.sql: removed no longer used copy_types_and_data(). use util.materialize_view() instead.