Git commits in Moodle 2.0.9 by Andrew Robert Nicols

commit bd10bc353db28e4c5dbcd75d9fd3aa9534034987
Author: Andrew Robert Nicols <andrew.nicols@luns.net.uk>
Date:   Mon, 05 Mar 2012 21:48:55 +0800
Tag:    v2.0.9

MDL-31877 Correct get_users exception

commit a892654fbc5b624b4806e2150a517f6d3a7e4252
Author: Andrew Robert Nicols <andrew.nicols@luns.net.uk>
Date:   Wed, 29 Feb 2012 01:15:28 +0800
Tag:    v2.0.9

MDL-31811 Add/Correct checks on activity read-only periods