Author: John Phoon
MDL-28592 webservices: Add manual unenrol users to external services
http://git.moodle.org/gw?p=moodle.git;a=commit;h=28e31ae43f1f3402b4a3f83c3fa922fd9b1af0e4
http://github.com/moodle/moodle/commit/28e31ae43f1f3402b4a3f83c3fa922fd9b1af0e4
+ 2.9 en [manualpluginnotinstalled,enrol_manual]