Update TODO. TimeStep make election comp checks tighter. Fix leader error stat in postmortem + extra stats (temp for now though)
setActionProbabilites() safety checks - sums to 1.0 and use NON_WEIGHTED if 50/50 for performance. Update TODO
Update TODO. Get agentProbailitySpread once for each nextNodeWeighted call.
Update TODO. Switch to weighted node selection for ChainExp