Author: Shamim Rezaie
MDL-61115 mod_lesson: Lesson overrides to observe group membership
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ca908dd42c0775b140df15329309d30833892028
http://github.com/moodle/moodle/commit/ca908dd42c0775b140df15329309d30833892028
+ 3.7 en [groupsnone,mod_lesson]