grabcut3d_segmentation now updates mask with pixel edits. Next step - redo segmentation
closing the loop with grabcut3d segmentation during pixel editing; fixing bug in color display
removing unused code
removing unneeded class var
fixing typo in grabcut3D error message; allowing CV_8UC1 and CV_8UC3 for the mask
grabcut3d_segmentation now converts the depth image to CV_8UC1 and sends it along to the grabcut3d. (which still doesn't use it, b/c the distance metric stuff isn't right)
removing commented out code