New formatter to view RecentChanges in a Mozilla / Netscape 6 sidebar. When the brows...

New formatter to view RecentChanges in a Mozilla / Netscape 6 sidebar. When the browser supports sidebars, a link named "sidebar" appears next to the rss icon which allows you to automatically add the new RC sidebar panel. A sidebar view of RecentChanges is smaller than the normal RC; by default it only shows 1 day of activity; and all nonessential page elements are removed. Clicking on any link in the RC sidebar opens the result in the main browser window.

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@2232 96ab9672-09ca-45d6-a79d-3d69d39ca109