Ramsey Discounting and Equity Weighting Options

[lrennels]

TODO items

• add Ramsey discounting and equity weighting options to deterministic scc runs
• add Ramsey discounting and equity weighting options to mcs runs
• update documentation in notebooks and README, and add tests
• update the examples in a second PR when this is all merged

[lrennels]

@bryanparthum I am revisiting this repository to add Ramsey discounting and equity weighting options for some work I am doing, which we may or may not merge depending on how confusing it would be for current users (we can discuss that when the time comes). In this work I was adopting the drop discontinuities stuff, and noticed that their had been a different spot allocated for each discount rate to count the discontinuities ... but am I right in saying that there's no real reason this would differ between discount rates?

Looking at the code for MimiIWG and PAGE2009, it cannot see how they could differ, given that the Discontinuity component does not pull from the Equity Weighting component ... which is I think the only way it could be drawing from discounted values. In general I'm moving away from the Equity Weighting component anyways to do my own discounting here, but that's besides the point

I'm not an expert on PAGE, and could be wrong, so don't waste your time digging too deep I can do that if I seem off! Just wondering if in your work you tend to expect the results to ever differ between discount rates or if those columns are always the same.