- Fixed '\n' => "\n".

- Bug #5684: filter duplicate headers.

- Patch 5140 by Moshe: removed the theme("header") and theme("footer") functions.

 - Adds drupal_set_header() and drupal_get_headers().
 - Cache now stores custom headers.
 - Replace theme_head() with drupal_get_html_head(), added drupal_set_html_head().
 - Added RSS autodiscover links to node, blog and taxonomy pages.

- Patch 4859: new drupal_unpack() consolidates duplicate code and makes it
  easy to show avatars next to nodes and comments.  Patch by Moshe.  As a
  showcase, maybe Xtemplate should have an option to enable/disable avatars?

- Reworked 404 (page not found) handling.  Patch by walkah.  You can specify a
  custom 404 page in the administration page.  As a result, error.php could be
  removed.

  + Changed drupal_page_header(): converts the If-Modified-Since header into a
    timestamp and compares against the cache data.  Ignore If-Modified-Since
    and ETag headers if they are present but empty.

  + Few minor other code cleanups.

- Small improvement to make request_uri() work on multiple platforms.

- Moved the watchdog() function to the bootsrap file.  Patch by Moshe.

- Improved module loading when serving cached pages.  Moshe's bootstrap patch.

- Used legend and fieldset tags for the configuration page.