PG-PuReMD: backport fixes from sPuReMD to control file parsing. Tools: formatting tweaks for MPI-GPU code.

sPuReMD: small updates to Python wrapper (data structure changes). Fix issue with system energies not being computed for step 0 with the wrapper.

PuReMD-old: fix issue where nonbonded time was incorrect when energy_update_freq > 1. Update tools/run_sim.py to include both total simulation time and mean time per step.

PuReMD-old: increase precision in log file to 4 decimal places for select fields. Merge MPI log parsing logic.

PuReMD-old: back-port run_sim.py from master branch. Update control file parsing to ignore sPuReMD/PG-PuReMD options.

sPuReMD: add missing header files when distributing (make dist). Fix OpenMP bug with ACKS2 geometry-dependent force contribution. Fix small OpenMP compilation issue. Update tools/run_sim.py to respect geo_format parameter and infer if not present for md_run_custom.

Tools: add functionality to run different code version (serial, OpenMP, MPI, MPI+GPU). Update sPuReMD control file parser to ignore non-shared memory parameters.

Tools: update run_sim.py to work with absolute paths (by refereing supplied executable path). Begin updating testing scripts.

Tools: fix MPI command. Change control file generation to be in running directory (for temporary directories and files) => necessary for running with MPI (shared filesystem needed across nodes).

sPuReMD: backport changes for reax_list, struct declaration/definition separation, interaction_function.