[vdr] Minimal VDR install

[Andrey Kuzmin]

> I usually start by installing the latest version of ubuntu on one
> computer and then duplicate that directory  for every client.

Completely   diskless   clients   booting  through  PXE or iSCSI  from
single image or from dedicated images from server are also worth  to  try.
This work fast on gigabit networks with dedicated network cards on server
per client. Haven't tried this with VDR yet, planning in future.