Git commits in Moodle 3.5.5 by Jean-Michel Vedrine

commit ffe4e082b089f75cad69ddb27a9a3243617dc748
Author: Jean-Michel Vedrine <vedrine@vedrine.org>
Date:   Tue, 19 Feb 2019 00:48:32 +0800
Tag:    v3.5.5

MDL-63905 qtype_multianswer: validate imported questions