This allows adding of new commands without any changes to command
parsing and generation code.

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

OS X install do not support long command line parameters.

Some very old and broken compilers complain about shadowing bcopy().

After sending command to videohub the response must read before
another commands is sent.

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 biggest Videohub seems to have 288 inputs/outputs.

It is not a good idea parse_cmd() to just die().