Add 'Newest' to product listing dropdown sorter

mysql.sql

UPDATE `catalog_eav_attribute`
SET `used_for_sort_by` = 1
WHERE attribute_id = (
SELECT attribute_id FROM `eav_attribute` WHERE `entity_type_id` = (SELECT `entity_type_id` FROM `eav_entity_type` WHERE `entity_model` = "catalog/product") AND `attribute_code` = "created_at");

UPDATE `eav_attribute`
SET frontend_label = "Newest"
WHERE `entity_type_id` = (SELECT `entity_type_id` FROM `eav_entity_type` WHERE `entity_model` = "catalog/product") and `attribute_code` = "created_at";