Profile and reorder execution to improve throughput of Geant4

by Efstathios Kamperis for CERN SFT

The purpose of this project is to devise a set of meaningful, reliable, reproducible and automated profiling methodologies acting upon the Geant4 toolkit, and subsequently make changes to the code in order to increase its throughput and decrease its execution times, without compromising its correctness or generating regressions and 2nd-order effects.