Exam submission

From my "commit" with the submission:

Exam submission. Code runs.

Two items were requested: treatment effects and parallelization, both on the simulation step.

Running ParallelRun.py achieves both goals. I changed the grmSimulation.py file; and created a script called ParallelRun.py to run everything, including making use of mpi4py (based on template.py).

It runs the simulation, outputting the same file as before plus one
with treatment effects. To run using MPI, use mpiexec on
ParallelRun.py. (I guess Eclipse should be able to do it too.)