Add support for svg output of the site pages.
Add support for svg output of the site pages.

Also make the common stylesheets for svg and fo be used
if not present in the specific skin.


git-svn-id: fea306228a0c821168c534b698c8fa2a33280b3b@9151 13f79535-47bb-0310-9956-ffa450edef68

apache/forrest,apache/forrest,apache/forrest,apache/forrest,apache/forrest,apache/forrest