JCSBimp's Hexagonal Orthogonal

I added a usage line, and also programmed the loop to look only at numerators which are even, cutting the number of iterations of the main loop in half. Thus repurposed variable “idx” as the Zone number, and added another variable to serve as the iteration counter. The revised code will be, and will from now on be, in an updated version of the code block in yesterday’s release post.