--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.