Bug#600134: The -n is optional

[Steffen Möller]

Hello, I just looked at it and from how I read the man page, the -n is
still optional. If all we need to do is just to remove the "-n", then I
suggest to just do it until lenny is no longer supported or the -n
became a requirement. Would alternatively the "--priority" flag work on
lenny? That change would of course not make it into squeeze but it
should help the backporting. Comments?

Best,

Steffen