Author: Víctor Déniz Falcón
MDL-46886 core_enrol: unenrolment due to inactivity notification
http://git.moodle.org/gw?p=moodle.git;a=commit;h=14cd15dfab401acf60fa20667704ce0800b236a2
http://github.com/moodle/moodle/commit/14cd15dfab401acf60fa20667704ce0800b236a2
+ 4.4 en [expiryinactivemessageenrolledbody,enrol_self]
+ 4.4 en [expiryinactivemessageenrolledsubject,enrol_self]