added output of unweighted parameters & pure weight map options

If you look a few lines lower I set the center of the jacobian properly using jacob.set_cen. I need the pixel scale to get the proper center. So I just pass an arbitrary center at first (which does not change the pixel scale determined by the determinant) and the update the center once the pixel scale has been calculated. This avoid creating more than 1 jacob object and having the jacobian computation being done in more than one spot.