v4.0

Well commented clean code.
Code blocks rearranged slightly to reduce duplicity.
v5.0

Final version, ready for submission.
Debug mode removed and code well aligned.

In cachesim_driver.cpp
Unix users please include <unistd.h>
Windows users please include "XGetopt.h"
Driver experiment

Defined constATT_MAX here instead of in cachesim.cpp for better function
isolation.