+ only adds an optional parameter to url() and l(), so individual links
can be set to be absolute
+ modifies drupal_goto() to accept the parameters of url() without the
$absolute parameter, so cleaner invocations can be used
+ rework of some code in node_feed, making it much better to look at
(the current code uses foreach with an immediate brake to get the first
key of the associative array, geeeeez)
+ added xml:base to the rss tag generated by node_feed()
+ set all user mail URLs to be absolute
+ fix a small fragmented URL in user.module
f137b26979