Git commits in Moodle 2.3.4 by Nathan Mares

commit fb9c26d0929eeb9489b7b10c42fc05034244f198
Author: Nathan Mares <nathan@catalyst-au.net>
Date:   Wed, 28 Nov 2012 07:21:32 +0800
Tag:    v2.3.4

MDL-36914: Re-associate all grade_item records when upgrading assignments to prevent data loss