Git commits in Moodle 2.7.3 by Neill Magill

commit 68153616be29e3351621956d3ee27cf5ce0e6ae8
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Fri, 03 Oct 2014 17:25:54 +0800
Tag:    v2.7.3

MDL-46182 Inefficient query during Moodle upgrade on course_section table.