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

[Sachin Kumar Singh]

Follow-up Comment #28, task #15713 (project gnuastro):

The function to find the farthest stars and assigning them as A and B is done
and pushed on gitlab
<https://gitlab.com/sachinkumarsingh092/gnuastro-matching-fits-nohealpix>.
Also, the result seems much better than before.

This function will assign the indexes of stars and hence I think instead of
using the make_hash function in the make_quad function we shall use make_hash
function in this function and return the final hash from here(we can change
its name to better suit its function later on).

Fo now in the image the function properly assigns the two farthest stars
indexes of A and B and the other 2 as C and D which satisfy the Cx<=Dx and
Cx+Dx<=1 condition:-)

(file #49593)
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Additional Item Attachment:

File name: Screenshot from 2020-08-01 05-41-55.png Size:25 KB
    <https://file.savannah.gnu.org/file/Screenshot from 2020-08-01
05-41-55.png?file_id=49593>



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