4ab8e69094
has_language_privilege, has_schema_privilege to let SQL queries test all the new privilege types in 7.3. Also, add functions pg_table_is_visible, pg_type_is_visible, pg_function_is_visible, pg_operator_is_visible, pg_opclass_is_visible to test whether objects contained in schemas are visible in the current search path. Do some minor cleanup to centralize accesses to pg_database, as well.