- call v.SetParam() after v.BindGLWindow()
	 - turn of dithering in mono/grey mode
	 - use prefposition to place the top left corner at (150, 150)
	   (so that the video remains visible during recording)
	 - default width is 256
Vcopy.py: correct typos; more verbose output.
OldVcopy.py: new name for Jack's old grabbing Vcopy.py.
Vstat.py: print values of all video parameters.