The first commit (the one that was reverted) contained a spurious,
unrelated change.

This reverts commit 2ed8cbd1.

The bta-no-usbpen was a link to /bin/sleep.

Passaggio ai target secondari (esame e graphical) attraverso comando 'start' invece di 'isolate' (NetworkManager non ripartiva più dopo il passaggio di target)

New feature (fix for someone...): don't erase user's home if the computer crashes or reboots during the exam.
The user's home is erased (if required) only when the exam mode starts the first time.

Fix: if the web service does not reply on machine boot, try 5 times then switch to graphical target.
If the WS does not reply when the machine is already in some exam mode or normal, do nothing.

FIX: stop action was empty, no reason not to resume kernel module instead (commands were commented).

Runtime parameters change had to depend on esame-get-config-boot service instead.
FIX2: firefox home set at runtime now kill every firefox instance before update firefox config file.

(I forgot to change folder's owner).

Fixed get-config to work on machines that were turned off in exam mode and must wake up in normal mode.