Clayton Barrows

the PGData struct is an intermediate type. Can we git rid of it and just use something more native to PSI, or Julia?

color matching is not flexible (palette is effectively hardcoded). The following function needs to be revised to improve flexibility: https://github.com/NREL-SIIP/PowerGraphics.jl/blob/master/src/definitions.jl#L66

Need to be able to aggregate (sum) and subset by - [ ] by `AggregationTopology` - [ ] temporal (e.g. by `Day`) - [ ] fuel - [ ] component...

- [ ] net - [ ] average - [ ] utilization factor - [ ] difference between multiple results

- [ ] duration curve - [ ] historgram

currently the interface is pretty wonky. We should review and improve.

If you want to link the RTS-GMLC paper, it's [here](https://ieeexplore.ieee.org/abstract/document/8753693)