Git commits in Moodle 2.1.5 by M Kassaei

commit 6bc136feff568b07f51f79ae40c813d66a13f9d2
Author: M Kassaei <m.kassaei@open.ac.uk>
Date:   Fri, 20 Jan 2012 19:59:14 +0800
Tag:    v2.1.5

MDL-31306 question preview: disable 'Fill correct' for qtypes that can't