Git commits in Moodle 3.6.5 by Didier 'OdyX' Raboud

commit 940608f34ffb58fb0314bb7699a72e549d918fdd
Author: Didier 'OdyX' Raboud <didier.raboud@liip.ch>
Date:   Thu, 14 Mar 2019 21:00:27 +0800
Tag:    v3.6.5

MDL-65067 analytics: Strengthen format_weeks detection