Bug 1307935: Extension of the file plugin to notify the user, when he reaches
a certain percentage of his quota. Optionally, the admin(s) are also notified.
The notification is sent only once until the user deletes files or one of the
corresponding settings (his quota or the notification limit) is changed so that
he's in the good again.

Change-Id: I36867155c399bfc288ce07085943f85ea4a37206
Signed-off-by: Tobias Zeuch <tobias.zeuch@kit.edu>
Merge "Bug 1307935: Extension of the file plugin to notify the user, when he reaches a certain percentage of his quota. Optionally, the admin(s) are also notified. The notification is sent only once until the user deletes files or one of the corresponding settings (his quota or the notification limit) is changed so that he's in the good again."