Author: Petr Škoda
MDL-44733 add support for disabling of scheduled tasks
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0a5aa65b5374066246c7613920ab68a4c96a14e7
http://github.com/moodle/moodle/commit/0a5aa65b5374066246c7613920ab68a4c96a14e7
+ 2.7 en [asap,tool_task]
+ 2.7 en [disabled,tool_task]
+ 2.7 en [disabled_help,tool_task]