combination of "emtpy" and "move" options

Hi,
nice script!

I added the possibility to combine the "emtpy" and "move" options.
I.e., "-me" will move the current container to the next emtpy WS.
This is pretty much the same behaviour as already implemented with "next" and "previous" in combination with "move", so I think it's straight forward to handle this case.

Regards,
Johannes