Git commits in Moodle 3.0.6 by Neill Magill

commit cb9594a285485865804df40e82e32e183ad9c67d
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Thu, 18 Aug 2016 15:49:59 +0800
Tag:    v3.0.6

MDL-55618 backup: Header should not be output twice

commit 21fcfae6b7c9a3327a86ed4bcdebb0761d37ca70
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Thu, 18 Aug 2016 15:49:37 +0800
Tag:    v3.0.6

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