Exam mode don't collect home-directories on localhome clients.
Deleting home of exam-users will result in potential data loss. But keeping
the home under the same name will prevent new exam at the next day.
Solution: Rename home (and /lmn/media/) of user after 12h and delete after 10d.
- user-home is on local disk
- additional entry in dolphin: home@server
- display info about localhome on login-screen
- provide unison-config for sync home with home@server
- force user to be logged out immediately after first login, because
home-dir must exists for bind-mounts on /lmn/media
