Production statistics improvements

[Vegemeister]

My first suggestion is fairly simple, and might be considered a minor bug fix. I've noticed that the amount of U-235 I've produced is anomalously high. On the "All" timescale, I see 482k U-235 produced, and 475k consumed. However, total production of atomic bombs is 169 (5070 U-235), and total production of nuclear fuel cells is 1.7 k (170 U-235).

I think the problem is that the kovarex enrichment recipe is being counted as consuming 40 U-235 and producing 41. I think the production and consumption statistics should only count the difference between recipe inputs and outputs. This would handle normal and feedback (kovarex and coal liquefaction) recipes correctly.

My second suggestion is that it should be possible to expand the consumption statistics by recipe. This would allow us to easily answer questions like, "What's sucking down all the green circuits?"