Degraded HST images are now sky subtracted
Until now, NoiseChisel was run on the degraded HST images only for the segmentation map. However, because of the bad Sky subtraction in the HST images (as shown in the previous commit), the F814W result was strongly affected. So we now run NoiseChisel on the degraded HST images first, save the segments, and then subtract the Sky value from the degraded image. The result in the F814W image is now reasonable.
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