Compiles and runs (gordon_qt_...refactored/)
Problems with registering two images of Brandon. Must remove background.
Still works, even with Brandon, but I must get rid of all the background, at least
one one of the images to get proper box cropping.

Consider adding a filter_z button to control the backend of the crop box.
Tried unsuccessfully to register two images provided by Brandon. Not enough points defining
Brandon to register him properly.