Git commits in Moodle 3.3.3 by Daniel Thee Roperto

commit 6afd56af461d22961e34ffe97dc79233246b2dcc
Author: Daniel Thee Roperto <danielroperto@catalyst-au.net>
Date:   Wed, 22 Feb 2017 12:58:39 +0800
Tag:    v3.3.3

MDL-58047 gradebook: fix sort by submission order.