[release] Prepare XE 1.9 release.
[release] Prepare XE 1.9 release.

git-svn-id: ffe117d4700a1f5efb0d898519c0bde20828e3e5@21148 f329d543-caf0-0310-9063-dda96c69346f

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