a dedicated sandbox user account from the nullmailer port.
Also add a pkg-message which describes how to tie down a USB
scanner to this sandbox using devd(8) in FreeBSD 8, as well as
describing what config files likely need editing.
Note: This text probably belongs in the FreeBSD Handbook.
Bump PORTREVISION.
Reviewed by: dougb (with edits to saned.in)
