Searching by SKU
Goal: Searching products using their SKU number. User can use comma to search by some SKU numbers on the same time.
Representation: textinput on the site front
Path: ext/by_sku
PHP class: WOOF_EXT_BY_SKU
Type: by_html_type
Html type: by_sku
Index: woof_sku
Type dynamic recount behavior: NULL
Shortcodes: [woof_sku_filter]
