NeMo Per-Core Activity using Event Tracing

[markplagge]

Using ROSS instrumentation (http://carothersc.github.io/ROSS/feature/instrumentation.html), there are a number of ways to gather info on a model.
This visualization will examine core activity/utilization over the simulation. Based on this, it looks like the simplest way to implement this is using the default event tracing method and filtering the end result to show activity.