Compounding flag

[tibkiss]

Idea from Brent P:
I had an idea about compounding. It's nice you can do this with the formula using nav, but in the software, (I assume) you know the cost of each structure, so what if there was simply a boolean compounding flag in the JSON? Then in the software you just do the calculation and simply scale all contracts to some percentage of nav (then that percentage could also be a parameter).
Then you could also warn or error if e.g. I specify $100 as my starting account value and there was never enough in the account to buy the structure? the warning only works for debits, but I think the compounding could work regardless.