used new image for default geo document

git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi@21057 99afaf0d-6903-0410-885a-c66a8bbb5f81
added preview file management by  administrator

git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi@21058 99afaf0d-6903-0410-885a-c66a8bbb5f81