XWIKI-895 add a getExternalURL to get the a full URL
XWIKI-895 add a getExternalURL to get the a full URL

git-svn-id: 50c93b9c2d9041e46610830dd7836bad08be8b2e@2209 f329d543-caf0-0310-9063-dda96c69346f

pbondoer/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform