Author: Sergey Gorbatov
MDL-49380 enrol_cohort: Automatically create a group if needed
http://git.moodle.org/gw?p=moodle.git;a=commit;h=73985b14257bf24434d0813c296c86cdfd06826a
http://github.com/moodle/moodle/commit/73985b14257bf24434d0813c296c86cdfd06826a
+ 2.9 en [creategroup,enrol_cohort]