Git commits in Moodle 2.3.0 by Alexnader Bias

commit 1b80a504182f728e3d8461e63b7b6891c64b888b
Author: Alexnader Bias <alexander.bias@uni-ulm.de>
Date:   Tue, 13 Dec 2011 13:17:43 +0800
Tag:    v2.3.0-beta

MDL-30472 Course Making user lists sortable when lastacess field is hidden