Author: Frederic Massart
MDL-28346 Backup: Added new status 'warning' for backup result
http://git.moodle.org/gw?p=moodle.git;a=commit;h=397afd71c380b8ffe3066086f5d4f35cd453ce43
http://github.com/moodle/moodle/commit/397afd71c380b8ffe3066086f5d4f35cd453ce43
+ 2.3 en [warning,core]