Remove synch condensers

[luke-kiernan]

Added scripts for building the system in PowerSystems: parsing matpower file, setting generator types/fuels from GIS/CATS_gens.csv, and adding time series from files linked in the readme. Also removed excess synchronous condensers by the following process:

1. Use Scripts/test_eval_condensers.jl to compute the power flows for all 8760 time steps with a penalty on reactive power, writing the qg values of the synchronous condensers to condenserReactiveFlows.csv.
2. Run Scripts/syncCondensers.jl, which reads condenserReactiveFlows.csv, selects which condensers to remove, and writes new matpower/generator data csv files for the system without those condensers.
3. Run Scripts/test_eval_condensers.jl again, this time on the new matpower file, to make sure the power flow problem remains feasible after removing the synchronous condensers. See also difficult-timesteps.jl.

There are a few lines in Scripts/test_eval_condensers.jl that may need to be commented/uncommented between steps 1 and 3. There are also some parameters to tweak syncCondensers.jl, as to how many condensers to remove. The data files for a system with ~200 condensers remaining are included in the GIS and MATPOWER folders. It may be possible to remove more condensers by repeating this process.