Git commits in Moodle 2.6.3 by Ashley Holman

commit 9a1e5b9911b65f200d046ccbd79e371a34f26090
Author: Ashley Holman <ashley@netspot.com.au>
Date:   Mon, 20 May 2013 10:45:29 +0800
Tag:    v2.6.3

MDL-39740 grade: Fix grade_item::add_idnumber strict type checking