Fixed #3491 -- Fixed links in `user-tools` section of admin's `base.html`...

Fixed #3491 -- Fixed links in `user-tools` section of admin's `base.html` template to use the `url` template tag.  This also removes the need for child templates to override the block just to adjust the relative path.  Thanks, saintsjd@gmail.com.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6391 bcc190cf-cafb-0310-a4f2-bffc1f526a37