• [groupmembership] Review logic of members and admins
• [groupmembership] Review logic of joinable and hidden groups
• [groupmembership] Edit printers joinable and hidden attributes
• [groupmembership] Warning for projects without admin
• [groupmembership] Separate view for teachers in a schoolclass
• [groupmembership] Display number of teachers in a schoolclass in the index view
• [listmanagement] Warning for users coming back from attic
• [listmanagement] Fix display of killable users