create "inventory" format & model-specific inventory to initial condition functions

[mdietze]

We should decide on a standard format for a "snapshot" of plot inventory data. This need not be the identical format that we would use for storing data from repeated inventories, which I think is a harder problem because of the need to assess change over time.

Once we have this we should split the function fia2psscss into two functions. The first, fia2inv would be responsible for extracting data and converting it to the standard format. The second, which might be something like inv2IC. which would be model-specific functions that would convert inventory data into model-specific initial conditions. For ED2 this would be essentially the second half of fia2psscss. For SIPNET, this will basically be computing the total pool sizes.

[github-actions[bot]]

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