Git commits in Moodle 3.8.x by Julien Boulen

commit af9bf5f609b25f3db8a02897807858b47638db8c
Author: Julien Boulen <julien.boulen@univ-rennes2.fr>
Date:   Tue, 28 Apr 2020 17:29:52 +0800
Tag:    v3.8.4

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