Git commits in Moodle 3.3.6 by Troy Williams

commit 3d9d924be6f565a192a075b2961c5ec8c0c51cfd
Author: Troy Williams <troy.williams@learningworks.co.nz>
Date:   Tue, 24 Apr 2018 12:01:04 +0800
Tag:    v3.3.6

MDL-61012 course: Allow extending class to set