Git commits in Moodle 3.7.1 by Tim Hunt

commit 6e5e4cc208484bb76fceac5dbaebeb37f5a89628
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Wed, 19 Jun 2019 00:14:37 +0800
Tag:    v3.7.1

MDL-57884 quiz: autosave should not send the value of submit buttons

commit 55929d8a49980a9dc1ec8eb8de3058fad75fdf58
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 07 Jun 2019 02:41:34 +0800
Tag:    v3.7.1

MDL-65864 question engine: fix re-saving a new usage

commit 15d5c9a276b42c8a9f5e265cef7ab33ad0875bb4
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Wed, 29 May 2019 20:38:41 +0800
Tag:    v3.7.1

MDL-65731 quiz manual grading: fix ambiguous order by idnumber

commit a586240cc0aef05d8c81997588e599ddf2edebe0
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 17 May 2019 22:35:54 +0800
Tag:    v3.7.1

MDL-55197 filter_multilang: handle 'en' as parent lang better

commit d2680dbb27610a7525e5932c67e274b78d3422e6
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 17 May 2019 22:18:06 +0800
Tag:    v3.7.1

MDL-55197 filter_multilang: move preg_callback fn into class

commit 09558248e801f998e7a4873e32045b4f90d9d724
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 17 May 2019 19:22:19 +0800
Tag:    v3.7.1

MDL-65636 filter_multilang: add some basic unit tests