Author: Damyon Wiese
MDL-59368 groups: Inplace editing for users groups
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2fa35b8d16d2b798af700ae40901b6e3806fa4cb
http://github.com/moodle/moodle/commit/2fa35b8d16d2b798af700ae40901b6e3806fa4cb
+ 3.4 en [editusersgroups,core_group]