Git commits in Moodle 2.3.5 by Howard Miller

commit 3c21fdc9ce4732e801659c3ab37d6d92c148f769
Author: Howard Miller <howard@e-learndesign.co.uk>
Date:   Tue, 05 Feb 2013 16:15:43 +0800
Tag:    v2.3.5

MDL-37797 HTML block: add contextid to block_positions query and make it more unique.