Volume and Centroid Functions for Primitives

by Chris Dueck for BRL-CAD

Currently, most primitives in BRLCAD do not have volume, centroid, or surface area functions. My goal is to implement volume and centroid functions for many of these primitives. As well, I will be refactoring major sections of mged's analyze command so that it makes use of the functions I will be adding. I also plan on cleaning up the comments found in the source code that I will be working on throughout my project.