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

[Sachin Kumar Singh]

Follow-up Comment #12, task #15578 (project gnuastro):

The required changes are made and pushed here
<https://github.com/sachinkumarsingh092/gnuastro/tree/task-is-sorted>. The
document is not changed yet. 

About comment #7, yes, I'd seen that wiki page prior to the elements 84's
article. The orientation matrix as shown in the wiki is just twice the matrix
used in calculating the area of a polygon by the shoelace formula
<https://en.wikipedia.org/wiki/Shoelace_formula>. And indeed this is what the
84's article was all about, checking the area of the polygon to find the
orientation. Hence both these are fundamentally similar.

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