MDL-40218 Assignment: Added show/hide suspended users functionality
MDL-40218 Assignment: Show suspended user, similar to the way they are shown in grader report
MDL-40218 Assignment: Participants/submission/grade count only include active users
MDL-40218 Assignment: User should not be able to view submissions, whithout proper permissions
MDL-40218 Assignment: Removed un-used variable
MDL-40218 Assignment: Added unit test to check suspended users
MDL-40218 Assignment: Added lazy loading for showactiveenrol option and supended users