Git commits in Moodle 3.2.6 by Daniel Thee Roperto

commit f6db0128186b23fb6a37b1e46cc714cba92deecb
Author: Daniel Thee Roperto <danielroperto@catalyst-au.net>
Date:   Wed, 22 Feb 2017 12:58:39 +0800
Tag:    v3.2.6

MDL-58047 gradebook: fix sort by submission order.