- Created 2 new functions:
    + path_uri(): returns the fully-qualified URI of your drupal site.
    + path_img(): returns the image directory or http://image-server.com/
                  in case you prefer to load-balance bandwidth usage.

  Replaced all occurences of the variable "site_url" with path_uri()
  and removed "site_url" from "setting.module".

- Drastically simplified the node_save() API, which should make the
  node-forms more secure.  Updated "story.module", "book.module",
  "forum.module", "page.module" and "node.module" to reflect this
  change.  This is needs more testing so hit it, beat it, tease it.

- Fixed an occasional glitch in the configuration file loading logic.

- Made "queue.module" display an informative notice when an anonymous
  user tries accessing the moderation queue.

- Updated the hard-coded information in drupal.module a bit.