Git commits in Moodle x.x.x by Juergen Zimmer

commit 895d364bcf865729cf1ebe3485962390c0147e2e
Author: Juergen Zimmer <jzimmer@silverserver.at>
Date:   Fri, 20 Jul 2012 01:15:38 +0800
Tag:    v2.4.0-beta

MDL-34118 question backup: fixes for usage prefixes in backups.