[task #16363] New section explaining "STD vs. Error"

[Mohammad Akhlaghi]

Follow-up Comment #1, task #16363 (project gnuastro):

Thanks Raul!

The added discussion too theoretical, so I edited it to be more practical
(actually making randomly valued images and measuring everything) in
[https://gitlab.com/makhlaghi/gnuastro-dev/-/commit/d44f10be4e15 Commit
d44f10be4e15] of the 'stderr' branch of my development project on Gitlab.

In the end, I reach a strange result that I don't have time to investigate (1:
the equation doesn't hold, 2: the error in mean doesn't change with number of
images). They are explained in a "cartouche" at the end of that section.

Can you read the new version of this section and see what I am getting wrong?


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