[Lias] Automatic "quota limit reached" notification

[ken at etherboot.org]

>> With FS quotas, the user gets a console message as soon as they try a
>> write above limit.
>
>That's not going to help much if they're not logged into the machine
>(e.g. using a Samba server).

But I believe it's also a reportable error from the write system call,
see EDQUOT in /usr/include/asm/errno.h.  If the application is written
correctly, you should get an immediate notification. Of course not all
applications do the right thing.

You'd still need the mail though, warnquota is for that.