Use $head->title for RSS Feed title
Reverted back to multi-line template, and added pubDate and guid (url)
Use a switch on $_REQUEST['datalist'] and require admin login on PHP_errors
Added created to update_rss() and added case for PHP_errors in datalist()

Remove xmlns in update_rss(). Was using Atom 1.0

Use `created` for <pubDate> in update_rss().