Git commits in Moodle 2.4.6 by Ruslan Kabalin

commit 5878abf8c6a81accdca949517abf98af0ebc3ac8
Author: Ruslan Kabalin <r.kabalin@lancaster.ac.uk>
Date:   Wed, 31 Jul 2013 16:46:07 +0800
Tag:    v2.4.6

MDL-40947: Fix segmentation fault issue in get_fast_modinfo.

commit 05342e935cf7dee12fdb83bb7a26ca55debb9201
Author: Ruslan Kabalin <r.kabalin@lancaster.ac.uk>
Date:   Mon, 29 Jul 2013 18:05:15 +0800
Tag:    v2.4.6

MDL-31226: quiz: Fix message for attempts built on previous.