A multithreaded PPHPC replication in Java 1.2.0

A multithreaded Java implementation of the [PPHPC](https://www.openabm.org/model/4693/) Agent-Based Model, developed with two goals in mind: 1. Compare the performance of this implementation with an existing NetLogo implementation. 2. Study how different parallelization strategies impact simulation performance on a shared memory architecture.
This is a companion discussion topic for the original entry at https://www.comses.net/codebases/4771/releases/1.2.0/