Author: Mark Nelson
MDL-63691 core: added capability for creating group conversations
http://git.moodle.org/gw?p=moodle.git;a=commit;h=59f98779fb9ef6db5ed4a29da791cec7632c0dd2
http://github.com/moodle/moodle/commit/59f98779fb9ef6db5ed4a29da791cec7632c0dd2
+ 3.6 en [course:creategroupconversations,core_role]