Git commits in Moodle 3.9.0 by Julien Boulen

commit 7d918bc6938087220bb414b88553489155485fc6
Author: Julien Boulen <julien.boulen@univ-rennes2.fr>
Date:   Tue, 28 Apr 2020 17:29:35 +0800
Tag:    v3.9.0-beta

MDL-68137 core_files: replace consecutive dots in filename by single dot