Include 'potato' in dselect/apt distribution list

[Tor Slettnes <tor@slett.net>]

Apparently a lot of packages for debian-arm goes into `potato', as
opposed to `sid'.  I noticed this only after having received
'installed' replies - they put much of that in potato.

My `/etc/apt/sources.list':

   deb http://http.us.debian.org/debian unstable main contrib non-free
   deb http://http.us.debian.org/debian sid main contrib non-free
   deb ftp://ftp.jimpick.com/pub/debian/netwinder/debs gandalf-local main contrib non-free non-US
   deb ftp://ftp.jimpick.com/pub/mirrors/debian-non-US unstable/binary-arm/ 


-tor