partitioned npp fluxes in history calculated after stem-counts change from mortality

[rgknox]

In the following line we assign the history output for NPP flux to leaves:

https://github.com/NGEET/fates/blob/sci.1.69.0_api.31.0.0/main/FatesHistoryInterfaceMod.F90#L3090-L3091

However, this flux is being calculated after disturbance and after non-disturbance mortality has been applied. In truth, we call allocation and growth before we call mortality and disturbance. Because of this, the model will allocate carbon in plants that are about to die.
Sad, yes. This carbon tracking is reflected accurately in the FATES mass balance checking, however, when we track this in history, we are not including those plants that grew and had died. They grew and should not be forgotten on their big final day.

We have had plans to split the history into a pre-disturbance and post-disturbance. This will come in after the implementation of this history density overhaul. The pre-disturbance history routine would be a great place to calculate these fluxes before their stem counts change.