Fixed numpy chained indexing bug#21
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Due to an indexing bug, a copy of the mask was updated instead of the mask_rej itself. This resulted in no pixels being discarded in the optimal photometry for sources with S/N <= 100 with too many outlier pixels, rather than rejecting the fraction of pixels with the highest deviation. This bug caused (seeing-dependent) jumps in light curves.
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Due to an indexing bug, a copy of the mask was updated instead of the mask_rej itself. This resulted in no pixels being discarded in the optimal photometry for sources with S/N <= 100 with too many outlier pixels, rather than rejecting the fraction of pixels with the highest deviation. This bug caused (seeing-dependent) jumps in light curves.