[Grml] grml-medium package requests

Hi mika,

I tried the -medium release earlier today, as I wanted to backup files off a Windows machine.

I should've looked at grml.org/files first, but I found sshfs, ntfs-3g and rdiff-backup were all missing. Since they're fairly small and quite useful for getting things off Windows partitions, I wondered if they could be included in -medium by default?

Cheers.