SMP mode compatibility

[epmikida]

Allow the simulator to run with SMP builds of Charm++

Simplest way would just be to use the current execution model and just fix issues currently causing SMP mode crashes (also determining what they actually are).

One step beyond that would probably be to have the GVT managers move be promoted to node groups, and manage the GVT computation for an entire node rather than core. Not sure how big of an improvement we could actually expect from this.

More advanced would be to have the scheduler be an SMP-aware scheduler (node group instead of group). This would be significantly more complex and require some research into the best way to synchronize.