cadCAD subset and run hierarchy

[BenSchZA]

A user of cadCAD, @rogervs, recently commented on the fact that run == subset + 1. This doesn't make much sense, as it doesn't provide useful additional info, instead there should be a hierarchy from simulation to subset to run to timestep, where the maximum of the former should never be larger than the maximum of the latter.

Illustrative example: an A/B test of 3 simulations, each with a parameter sweep of 3 parameter sets, 3 Monte Carlo runs, and 100 timesteps.

It should have a hierarchy of a simulation per config that’s simulated, subset per parameter set in the sweep for each simulation, and a run per Monte Carlo run for each subset.

In total, we'd expect 333 or 27 sets of data of 100 timesteps each.

This is probably just a bug or oversight?

[JEJodesty]

This hierarchy exists in staging