bugfix: schemas/util.sql: truncated_prefixed_name_regexp(): need to pass max_prefix_len to util.name_was_truncated() because although the name itself might not have been truncated, it might become truncated once prefixed

schemas/util.sql: name_was_truncated(): support max_prefix_len param to determine truncation of something that will be prefixed

fix: name_was_truncated(): should use util.namedatalen() instead of hardcoding the value

schemas/util.sql: replace_suffix(): support strings that have been truncated (eg. as a table name) due to the prepending of a prefix

schemas/util.sql: added truncated_prefixed_name_regexp()

schemas/util.sql: added rtrim_n()

schemas/util.sql: added name_was_truncated()

schemas/util.sql: added namedatalen()

schemas/util.sql: drop_relation(regclass), rename_relation(regclass): use util.qual_name() instead of ::text so that the schema qualifier is always included in the debug SQL

schemas/vegbien.sql: added rename_query_view(), which renames all DB objects related to a particular validations query