Allow Team Leaders to import course completion for their own team only

1) If a TL can only see users in their Team, assign training, run reports, etc. Should only be able to import course completion for those users.

2) Additionally, to mark someone as completed, but to then to manually unassign user from the course because the LMS inadvertently assigned the user to the individual course. Something Litmos LMS should have setting / system controls for.