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: refactor tri solve level sched memory management. Change OpenMP thread scheduling policy to static. Modify logging output format.

sPuReMD: fix diagonal preconditioner computation and level scheduling application. Modify preconditioner logic to compute and cache sparsity-based info. Update run script.