2005-10-25, Maria M S: 
	    su->response_file in io.c is not used.
	    No action taken.
2005-11-01, Maria M S: 
	    Projection generation with the detectors SHAPE_PLANAR and
	    SHAPE_CYLINDRICAL_AROUND_SOURCE gives wrong result in the
	    vertical direction due to a missed (douple)-casting.
	    Fixed.
2005-11-07, Maria M S: 
	    su->filter is not initialized.
	    Fixed.
2005-11-07, Maria M S: 
	    The planar detector is only working when placed 
	    in the reference center. 
	    Fixed.
2005-11-09, Maria M S: 
	    su->mono_i is neither initialialized nor controlled.
	    Fixed.
2005-11-09, Maria M S: 
            su->voxels[0], su->voxels[1], su->voxels[2],
            su->voxlen[0], su->voxlen[1], su->voxlen[2],
            su->vox_center[0], su->vox_center[1], su->vox_center[2]
	    initialized.

