Git commits in Moodle 3.1.0 by Peter Miller

commit f3460b0fc61923e22c7fca8dd13f4275ec918409
Author: Peter Miller <peterm9@goshen.edu>
Date:   Mon, 04 Jan 2016 17:52:30 +0800
Tag:    v3.1.0-beta

MDL-52078 gradebook: Stop totals including hidden items.