[Illidan]

• Covers upload now attempts to automatically select the correct scan caption by using the file name.
• Added twitter field and timeline to products.
• Added twitter field and timeline to labels.
• Updated twitter timeline to the latest version, should fix the visual issues and load faster.
• Merged recent and upcoming works for products and labels, to be consistent with artists.
• Added new roles (Assistant, Assistant Engineer, Scriptwriter) to advanced search.
• Podcast and radio links were down and are now hidden.
• Unconfirmed and banned users can no longer leave ratings.
• Fixed artist->artist links not being cleaned up when deleting an unit that still had members.
  Orphaned entries already in the db (showing up as empty lines in the Units section of artists) were cleaned up manually (thanks SS!)