[task #13658] Work on concave polygons too

[Sachin Kumar Singh]

Follow-up Comment #45, task #13658 (project gnuastro):

Done here
<https://github.com/sachinkumarsingh092/gnuastro/tree/task-concave-sort>.
Also, sorry I forgot about the usage of conditional operators for if else in
compare functions before rebasing and pushing. But probably you will be doing
some more changes in a new commit and hence I didn't rebase again. Can you
please fix them when you do the final changes? Thank you;-)

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