* Factored and removed some redundant style information that crept in over time.

* Fixed the paths for the XML button.

* Added an orange XML button to access the rdf files for the
various news feeds on the news index pages.

* Fixed a bug that caused news articles which were received by
mail to be bounced because the script was looking for HTTP_HOST in
the environment, and that variable didn't exist in the mail
receiving environment.