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

[Sachin Kumar Singh]

Follow-up Comment #12, task #15713 (project gnuastro):

Thanks, Raul. This will certainly give users flexibility. I'll try to
implement it alongside. 

Also, I read this <https://arxiv.org/pdf/1909.02946.pdf> paper in which they
created a 3-star quad system to create the astroalign python package. It
demonstrates the scenarios in which a 3-star system would be better. 

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