XWIKI-6075: Create XWiki Commons top level project
XWIKI-6075: Create XWiki Commons top level project

* Move xwiki-management to commons

git-svn-id: d23d7a6431d93e1bdd218a46658458610974b053@35176 f329d543-caf0-0310-9063-dda96c69346f

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