Log Message:
Update to Trac 0.8.4  (June 19, 2005)
http://svn.edgewall.com/repos/trac/tags/trac-0.8.4

Upstream changelog:
 * Fixed file upload vulnerability. Trac could be tricked into
   uploading files outside the environment directory. All users
   are recommended to upgrade. Vulnerability found by the Hardened-PHP
   project.

Thanks adrianp@NetBSD.org for the heads-up.