Git commits in Moodle 3.6.6 by Paul Holden

commit ca1929d3906e8418ee58dd37a80e3e51a86ef9fe
Author: Paul Holden <pholden@greenhead.ac.uk>
Date:   Thu, 04 Apr 2019 19:34:32 +0800
Tag:    v3.6.6

MDL-62161 user: preserve all selected users between searches.


commit 0fb84542b5dc7ea3ab3b3f2ec2f0e15f57ea1580
Author: Paul Holden <pholden@greenhead.ac.uk>
Date:   Tue, 02 Apr 2019 20:41:46 +0800
Tag:    v3.6.6

MDL-33087 tool_capability: correct role override link.