Git commits in Moodle 2.2.4 by Jonathon Fowler

commit f3248ac9f202e885eaabb4a0e51c9bb5cf4fe603
Author: Jonathon Fowler <fowlerj@usq.edu.au>
Date:   Wed, 09 May 2012 09:51:18 +0800
Tag:    v2.2.4

MDL-32863 question: fix for Oracle ambiguous column error


commit d5e59d895087f0168a93bfb04b434534997cb596
Author: Jonathon Fowler <fowlerj@usq.edu.au>
Date:   Tue, 28 Feb 2012 12:53:47 +0800
Tag:    v2.2.4

MDL-31804 duplicated columns cause Oracle error in grader report