[task #15578] Function to find if polygon vertices are sorted anti-clockwise

[Sachin Kumar Singh]

Follow-up Comment #14, task #15578 (project gnuastro):

Added debugging procedures is inserted and the previous requirements are done
here <https://github.com/sachinkumarsingh092/gnuastro/tree/task-is-sorted>.
Documentation will be pushed in(probably) next commit when everything works
fine.  

One nagging problem I encountered is when `i` in
`gal_polygon_to_counterclockwise` is declared as *unsigned* long(or size_t) it
prints -ve values and causes segmentation faults but such problems do not
arise when using long. How to overcome it?

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