[vdr] Overwriting channels.conf

[Tony Houghton <h@realh.co.uk>]

Vdr seems to overwrite its channels.conf occasionally and basically mess
it up. I set it up with the Freeview numbers for DVB-T, but today found
that BBC 3 had moved to 192, and BBC 4 (also moved to 19-something IIRC)
was "unavailable". It was available again when I put my previous
channels.conf back.

BTW I've written a little perl script to sort the output of tzap -u in
case anyone's interested. It tends to need more than a trivial one-line
sort command because of the channel numbers being on separate lines and
having variable numbers of digits.

-- 
TH * http://www.realh.co.uk