Update utils.py - add Median Absolute Deviation option to radial_profile

[saikrishanthpm]

Added ability to compute median absolute deviation (MAD) to the radial profile function. MAD is a better estimator than standard deviation for smaller datasets, being more robust to outliers.

[mperrin]

@saikrishanthpm Thank you for this PR adding the median absolute deviation option. I've tested it and it looks good to me.

For completeness I added to this PR some unit test code that exercises this option and the stddev option (this test could be made a lot better -- for now it just checks that the code runs without error and the output array has the correct number of bins, without any check of the correctness of the output values. But, better than no test at all!). I'll verify the CI tests all run with that addition and then merge.

Thanks again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8e2d84d) 74.46% compared to head (7b1babb) 74.13%.
Report is 29 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #591      +/-   ##
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- Coverage    74.46%   74.13%   -0.34%     
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  Files           18       18              
  Lines         6549     6558       +9     
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- Hits          4877     4862      -15     
- Misses        1672     1696      +24     

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