I was curious as to why shuffling of events with the same time-step 
isn't optional. From reading the Schedule code, the sub steps with the 
same time-step (and same ordering) are extracted into a bag and 
randomised using the shuffle method.

In some situations, particularly debugging it might be preferable to 
retain the order of sub steps from step to step, or even retain the 
order in which events were scheduled.

Would it be possible to just add a flag which is set to indicate if the 
schedule should be randomised or not, or does something else rely on the 
assumption of random ordering.



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