Do all Monte Carlo variable distribution definitions need to be defined in `@defsim`

?

The new version of PAGE has quite a few MC variables, and I would like to keep them associated with the components for which they apply. Concretely, I am wondering if I can do something like the following, for our CO2Cycle component:

```
function montecarloCO2Cycle(model)
model[:res_CO2atmlifetime] = TriangularDist(50, 100, 70)
...
end
```

where all of the MC variables associated with the COCycle are set in a function, and that function is defined in the CO2Cycle.jl file.