Git commits in Moodle 3.4.3 by Troy Williams

commit 31ebe1ff67228dc0aa1c911946526ac8336117f5
Author: Troy Williams <troy.williams@learningworks.co.nz>
Date:   Tue, 24 Apr 2018 12:01:04 +0800
Tag:    v3.4.3

MDL-61012 course: Allow extending class to set