renamed dvsink-files-command to dvsink-tee, as it does not
have the same semantics as dvsink-command. Well it also has not exaclty tee semantics either,
as the command is not on stdout, but given with -c.

dvsink-command always streams, ignoring the 'Recording' state of dvmix.
dvsink-tee only streams, if 'Recording' is on.

Version 0.4 of the dvsink-bambuser script has a -r flag that effects this new semantics.
(and will do recording).

General advice, never stop recording once it is running. dvsink-tee may bail out, when you try
to continue recording.