Renamed txp_pane class to Textpattern_Admin_Pane.

The last one closes issue #368

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5326 2fea6a4d-a838-0410-917b-93a53c48e9d2
Remove left padding on nav-tertiary lists

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5327 2fea6a4d-a838-0410-917b-93a53c48e9d2