4a27a6da improve/comment Slurm example codes

examples/slurm/README.md

examples/slurm/python_multiprocessing.py

examples/slurm/python_multithreading.py

examples/slurm/submit_mpi4py.sh

examples/slurm/submit_multiprocessing.sh

examples/slurm/submit_multithreading.sh

examples/slurm/submit_sequential.sh

exercises/Python-refresher-Exercise.ipynb

exercises/_solutions/Advection-withsolution.ipynb

exercises/_solutions/Casio-CZ-5000-Synth-Bass-C1.wav

exercises/_solutions/Diffusion_MPI_withsolution.py

exercises/_solutions/Diffusion_serial_withsolution.ipynb

exercises/_solutions/Kawai-K5000W-Fret-Noise.wav

...ises/_solutions/MPI-solutions/block_data_decomposition.py

exercises/_solutions/MPI-solutions/ping-pong.py

exercises/_solutions/MPI-solutions/ring.py

exercises/_solutions/MPI-solutions/scatter_gather.py

exercises/_solutions/MPI-solutions/scatter_reduce.py

exercises/_solutions/NumPy_Exercise_withsolution.ipynb

exercises/_solutions/Parallel_Exercise_withsolution.ipynb