Author: Frederic Massart
MDL-33812 Backup: Respect of backup_auto_keep
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e2aebdc928a6452528cc280babba3b7dde055ce6
http://github.com/moodle/moodle/commit/e2aebdc928a6452528cc280babba3b7dde055ce6
+ 2.4 en [backup_shortnamehelp,core_admin]