Author: Frederic Massart
MDL-28346 Backup: Added new status 'warning' for backup result
http://git.moodle.org/gw?p=moodle.git;a=commit;h=05e521c9bcb8f560b70a416f79cf4d233563eaaa
http://github.com/moodle/moodle/commit/05e521c9bcb8f560b70a416f79cf4d233563eaaa
+ 2.4 en [warning,core]