Ghost User
2019-02-09T19:02:13+01:00

Closes #478

### Short description
Add 'Display members' field for MemberGroup

### Steps to use this feature

1. Check 'Display members' in the Boards/Committees/Societies admin page to show members for that MemberGroup.
2. Uncheck 'Display members' in the Boards/Committees/Societies admin page to not show members for that MemberGroup.