replace with a type field with one of two values (head and block). We need to
do this to determine what fields go in the rss block so we can ignore the
definitions that are related to the page head when creating the rss block that
goes into the sidebar.
url to rss/feed/<feed name>/[<id>]
Where feed name is the name of the feed (i.e. albums, updates, comments, tags
etc.) and id is the optional element id that the feed applies to.
2) Protect the fullsize image with a permission check
3) Added a content:encoded element to each item which allows the image to show up in the body of the feed.
