anti-abuse facilities

Already twice in the last 6 months, an uploader managed to fill up our disk by uploading the same package over and over, without ever getting it sponsored.

Things we could implement:

overall user quota
administrative block of new uploads
admin notes attached to the user (in nm2, called "fd_comments", they are incredibly useful)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information