Git commits in Moodle 3.5.6 by David Mudrák

commit 8ef6c25a98c37fa5c0ec117115001c51556f3896
Author: David Mudrák <david@moodle.com>
Date:   Fri, 10 May 2019 16:35:54 +0800
Tag:    v3.5.6

MDL-65537 lang: Use fixed strings in tests, too


commit 15d115760006d799a91096abd3b8019c04a28eff
Author: David Mudrák <david@moodle.com>
Date:   Thu, 14 Mar 2019 04:28:48 +0800
Tag:    v3.5.6

MDL-64994 analytics: Improve the Python package version check


commit 959c70e87bc6c101ee24f0ceb7cae16d8304db66
Author: David Mudrák <david@moodle.com>
Date:   Wed, 06 Mar 2019 03:01:28 +0800
Tag:    v3.5.6

MDL-64996 analytics: Make sure the no_teaching model is trained


commit 8e2360f9c82f1406a43f8c538d59baa437c6b4b5
Author: David Mudrák <david@moodle.com>
Date:   Wed, 06 Mar 2019 02:57:52 +0800
Tag:    v3.5.6

MDL-64996 analytics: Don't mark static model as untrained after clearing


commit a1026db0fe05c978cf4ad46f6deaa88b73b0953a
Author: David Mudrák <david@moodle.com>
Date:   Tue, 05 Mar 2019 20:47:14 +0800
Tag:    v3.5.6

MDL-64994 analytics: Add a simple semantic version check method