Thanks to alex # dyaconov.com for the test data

It doesn't seem to do anything and just spams that logs. Thanks to
Jean-Francois Panisset for the report.

  --list-vinputs   ->  --list-inputs
  --list-voutputs  ->  --list-outputs
  --list-moutputs  ->  --list-monitor
  --vi-X           ->  --in-X
  --vo-X           ->  --out-X
  --mo-X           ->  --mon-X
  --se-X           ->  --ser-X

My Videohub Micro doesn't support this extra but I suppose the
bigger models do (at least the official software v6 reads this
value and shows it instead of the device model).

--list-proc-units was documented in 1.0 release but it was never
wired up to work. --list-frames was not documented in 1.0 and it
wasn't working either.

It is not tested on a real hardware. The number of frame buffers
is assumed to be the same as number of serial ports (as good guess
as any).

It is not tested on a real hardware.

Now both sides of a connection are seen:
  input  -> output(s)
  output <- input

This prints the device configuration as videohubctrl parameters thus
allowing the configuration to be restored later.

Add support for setting video input/output names, video output locking
and video output routing.

Show port numbers next to inputs and outputs and locks next to
outputs to better reflect the logic for their manipulation.

Now the short parameter is the first letter of the long parameter
which is much more natural.

The short -h parameter will be used to set device host name.

The routing was completely reversed and buggy. It should be done by
output instead it was done by input.