Git commits in Moodle 3.1.2 by Neill Magill

commit 68cbd916a605a0568c77b4eebb5cad8760dbf2df
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Thu, 18 Aug 2016 15:49:59 +0800
Tag:    v3.1.2

MDL-55618 backup: Header should not be output twice


commit 6130c2493f6e2c8f28ca5f283bba0165ccc29aa2
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Thu, 18 Aug 2016 15:49:37 +0800
Tag:    v3.1.2

MDL-55617 backup: Possible fatal errors in backup and restore