Git commits in Moodle 3.10.0 by Dan Marsden

commit 58bf73049454d2d610524c81b84eae161d1cef9a
Author: Dan Marsden <dan@danmarsden.com>
Date:   Fri, 03 Jul 2020 07:23:17 +0800
Tag:    v3.10.0-beta

MDL-69190 grade: fix slow query.