MDL-42875 users: Show only profile visible roles on participants list
MDL-47918 forum: Coding style fix
MDL-47950 course: Adding sesskey confirmation when duplicating activities
MDL-47972 mod_quiz: Fix new quiz on themes based on base.
Merge branch 'MDL-47972' of git://github.com/timhunt/moodle
Merge branch 'MDL-42875_master' of https://github.com/crazyserver/moodle
MDL-47875 choice: chat module strings not required from Choice anymore

AMOS BEGIN
 CPY [chatintro,mod_chat],[description,mod_choice]
AMOS END
Merge branch 'MDL-47875_master' of https://github.com/crazyserver/moodle
MDL-47959 mod_quiz: fixed 0 questions bug
MDL-47919 tool_monitor: only use set_label() on valid object
on-demand release 2.8beta+