[task #15713] Make quad structure to make unique hashes of 4 objects

[Sachin Kumar Singh]

Follow-up Comment #23, task #15713 (project gnuastro):

The function for visualizations is done. For the function, I assumed that the
array will be sorted, but is it okay or should I explicitly sort the array for
every polygon and then display. Which one would be better?

But the results are good. Good thing the accumulation of quads in a single
area is not done anymore:-) In the image of a single quad, it looks like a
triangle but if we zoom on the left corner, the two points are so close that
they seem to like it. It is expected because we select the n, n-2, and n-4
stars for a quad. The n, n-2, in this case, are very far from the reference
star while the n-4 is quite near. I've also attached the region file for a
quick check.

(file #49565, file #49566, file #49567, file #49568)
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Additional Item Attachment:

File name: Screenshot from 2020-07-29 05-27-22.png Size:701 KB
    <https://file.savannah.gnu.org/file/Screenshot from 2020-07-29
05-27-22.png?file_id=49565>

File name: Screenshot from 2020-07-29 05-26-54.png Size:295 KB
    <https://file.savannah.gnu.org/file/Screenshot from 2020-07-29
05-26-54.png?file_id=49566>

File name: Screenshot from 2020-07-29 05-27-03.png Size:209 KB
    <https://file.savannah.gnu.org/file/Screenshot from 2020-07-29
05-27-03.png?file_id=49567>

File name: polygon.reg                    Size:11 KB
    <https://file.savannah.gnu.org/file/polygon.reg?file_id=49568>



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