bugfix: schemas/public_.sql: analytical_stem_view_modify(): added columns: need to include COMMENT statements

bugfix: schemas/util.sql: comment(element oid): need `objsubid = 0` filter so this doesn't use comments for any other objsubids

schemas/public_.sql: added iucn_red_list_view_modify() and use it in iucn_red_list_view's "after updating this" instructions

bugfix: schemas/util.sql: rematerialize_view(): also need to handle the target table's dependent views

bugfix: schemas/util.sql: mk_drop_from_create(): need to use `IF EXISTS` so that the resulting statement also works if the target object does not yet exist

schemas/util.sql: mk_drop_from_create(): also support `SELECT util.drop_*()` statements, in addition to DROP

schemas/util.sql: replace_words(): use map_words() to enable inlining the concatenated hstore, so that it doesn't need to be concatenated on each function call

schemas/util.sql: added map_words()

schemas/util.sql: added date_from_spanish()

schemas/util.sql: added replace_words()