Notification of string changes

Author: John Yao
MDL-65729 Backup: Split individual backups into ad-hoc tasks
* refactor run automated backup
* new backup status of Queued
* adhoc task for backing up a course
* course locking for course backup adhoc task
* use Moodle locking instead of custom locking for run automated backup task
* add unit tests to extracted methods


http://git.moodle.org/gw?p=moodle.git;a=commit;h=d0734df40426c40eae9bde0cc41c08b43560962b
http://github.com/moodle/moodle/commit/d0734df40426c40eae9bde0cc41c08b43560962b

+ 3.8 en [backupadhocpending,core]
+ 3.8 en [queued,core]