Git commits in Moodle 2.5.6 by Jean-Michel Vedrine

commit e87688d1f4672edceadf9a5a120c7f4b57b96c62
Author: Jean-Michel Vedrine <vedrine@vedrine.org>
Date:   Wed, 07 Aug 2013 16:02:36 +0800
Tag:    v2.5.6

MDL-41063 Lesson qformat_default class is missing an error function