Git commits in Moodle 3.3.6 by vinhle

commit 3c75559a6aa4cd4ab15fc9a7780cf2071815df94
Author: vinhle <lethevinh.qng@gmail.com>
Date:   Mon, 23 Apr 2018 15:43:25 +0800
Tag:    v3.3.6

 MDL-61715 question: qbank_chooser is not intelligent about headings