[task #16447] Median Absolute Deviation based clipping

[Mohammad Akhlaghi]

Follow-up Comment #1, task #16447 (project gnuastro):

Below you can see the 9 individual exposures of the script in the P.S. of the
first comment. The first one with a bright circle is clearly visible:

(file #55196)

And here is the four outputs of sigma-clipping:

(file #55197)

It is clear why the circle has remained after the sigma-clipping! The median
has been more robust than the mean, hence why I have smoothed it in this
image. But if you just slightly smooth the image (or warp it to larger
pixels), you will clearly see the remaining effect which can have bad effects
when pushing the data reduction to the limits.


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