MDL-47737 editor_atto: Prevent false negative when saving draft on IE9
MDL-47735 core: prevented iteration of 'groupmembersonly'

The course module variable 'groupmembersonly' was removed in 2.8.
MDL-47735 mod_forum: added 'My profile' -> 'Forum posts' behat test
Merge branch 'MDL-47737-master' of git://github.com/FMCorz/moodle
MDL-47736 editor_atto: only save/restore draft when necessary