Make like a singleton the eventmanager

git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi@21997 99afaf0d-6903-0410-885a-c66a8bbb5f81
IN PROGRESS - issue SPAGOBI-1610: fixed a problem that occured when the wizard was closed without applying the new configuration

git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi@21998 99afaf0d-6903-0410-885a-c66a8bbb5f81