Adjust physics-based reconciliation of EIA-930 data

[grgmiller]

Zooming in on the eia930 profile for nuclear, I noticed that the nuclear profile seems to be pretty variable:

However, looking at the reported EIA-930 data for nuclear in January 2020 reveals what we would expect: that nuclear should be pretty flat:

I'm thinking that this is likely a result of the physics reconciliation code, and makes me think that we need to adjust the weighting on the reconciliation so that certain fuel types like nuclear can't be adjusted in this way, or go back to using the raw generation data for the residual calculation (#104).

Originally posted by @grgmiller in #230 (comment)

[grgmiller]

We may want to tune the parameters to only adjust the interchange data, rather than the generation or demand data.