make_phot_info_dict getting psf at wrong position

[rknop]

        psf = PSF.get_psf_object( 'OversampledImagePSF',
                                  x=diff_img.data.shape[1]/2., y=diff_img.data.shape[1]/2.,
                                  oversample_factor=1.,
                                  data=psf_img.data )

I think that x and y should be at the position of the supernova on diff_img, not at the center of the image.

I also think (THINK ABOUT THIS) that we want to round to the nearest integer.

[rknop]

That would be x=pxcoords[0], y=pxcoords[1], I think.