Git commits in Moodle 2.4.5 by Andrew Davis

commit f34634eaf3e4aa38155843529a11f5932ca645bd
Author: Andrew Davis <andrew@moodle.com>
Date:   Fri, 26 Apr 2013 10:37:52 +0800
Tag:    v2.4.5

MDL-35859 core_grade:fixed an optional parameter call to use the array version

commit 4dd5ce20ffd4d2c31c1f49bc4ab797215e6fe4cc
Author: Andrew Davis <andrew@moodle.com>
Date:   Mon, 28 Jan 2013 12:03:59 +0800
Tag:    v2.4.5

MDL-36090 core_grade: added logging of overriding of student grades