Git commits in Moodle 2.8.3 by Dave Cooper

commit 5c703c83fd0e101c75ebd5da9fbca08f7b02de72
Author: Dave Cooper <dave@moodle.com>
Date:   Mon, 19 Jan 2015 13:16:48 +0800
Tag:    v2.8.3

MDL-48776 core_message: Fixed userid check.

commit 19f78c1c84e0f22c6ce5cca143acbc90865dd288
Author: Dave Cooper <dave@moodle.com>
Date:   Thu, 08 Jan 2015 16:41:20 +0800
Tag:    v2.8.3

MDL-47935 Atto: Moved atto notification message position