- fixed handling of malformed "partType" filters coming in from the wild
- removed the "Parts" & "Products" tabs from the /photos page
- restored the "products" and "parts" filter checkboxes on the /photos page
- fixed missing product id in the sku picker on the /modify_part page (reported by Engledogg)
- fixed bad /part_details link on the photo admin page (reported by Engledogg)
- fixed broken "primary photo" sort on parts/products pages
