Exam submission. Code runs.

Two items were requested: treatment effects and parallelization.
Running ParallelRun.py achieves both goals.

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.)

In summary: I changed the grmSimulation.py file; and create a script to
run everything, including making use of mpi4py (based on template.py).