Add support to BibTemplate for arbitrary XML chunks (DOM node) via the "xml" construc...

Add support to BibTemplate for arbitrary XML chunks (DOM node) via the "xml" constructure param, which disables automatic format-specific fetching.

Add a new module, openils.FeedTemplate which, given:

 * an xml feed (URI or pre-collected DOM node)
 * a dojo.query to pull out items from the feed
 * the DOM node of a template to clone for each item
 * the target DOM node into which it should shove the item-filled template instances

will render a feed of arbitrary xml for you.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@17266 dcc99617-32d9-48b4-a31d-7c20da2025e4