Git commits in Moodle 2.4.x by Lorenzo Nicora

commit ab519e888b99624046ba670bf97f1c9bc849a79a
Author: Lorenzo Nicora <lorenzo.nicora@gmail.com>
Date:   Sun, 10 Jun 2012 15:25:19 +0800
Tag:    v2.4.0-beta

MDL-33531 Fixed the regexp to find old backup files, considering backup_shortname backup option