Git commits in Moodle 2.8.10 by Barry Oosthuizen

commit 9486c3fe5c266792b8d7798ace9dcf08e6af332d
Author: Barry Oosthuizen <barry.oosthuizen@nottingham.ac.uk>
Date:   Tue, 27 Oct 2015 01:22:31 +0800
Tag:    v2.8.10

MDL-51913 report_stats: Make first column unique