Enable Associating Embodied Emissions of commodities from RoUS at the border #13

Currently the embodied emissions for RoUS commodities consumed by SoI are associated either with:

1. Commodity finally consumed by SoI, which could be that RoUS commodity directly or it could be an SoI commodity if the RoUS commodity is consumed by industry to make the SoI commodity. Say SoI gets furniture from RoUS but uses it as an input to Housing. You will see the emissions from the furniture associated with the SoI Housing commodity. This is what you get with perspective=FINAL in calculateStateCBE.
2. The commodity where emissions originally occurred. So if it was an RoUS commodity it will be the activities (also represented by commodities) in the supply chain where the emissions occured. Say SoI gets furniture from RoUS but and some emissions occur in wood products production in RoUS, those emissions are associated with wood products, RoUS. This is what you get with perspective=DIRECT in calculateStateCBE.

The point here is to find a 3rd option that is in between but is more intuitive. In this example, associating those emissions with furniture, RoUS.