Author: Peter Burnett
MDL-45849 enrol_self: Added self enrol capability
http://git.moodle.org/gw?p=moodle.git;a=commit;h=37c99bd07e8000ef351a428158b3ac3c6d4f99c0
http://github.com/moodle/moodle/commit/37c99bd07e8000ef351a428158b3ac3c6d4f99c0
+ 4.0 en [self:enrolself,enrol_self]