romulus97/CAPOW_PY36: Original CAPOW code for Python 3

Version of CAPOW used in:

Su, Y., Kern, J.D., Reed, P., Characklis, G. (2020). "Compound Hydrometeorological Extremes Across Multiple Timescales Drive Volatility in California Electricity Market Prices and Emissions". Applied Energy.

Kern, J.D., Su, Y., Hill, J. (2020). "A retrospective study of the 2012-2016 California drought and its impacts on the power sector." Environmental Research Letters. 15 094008

Su, Y., Kern, J., Denaro, S., Hill, J., Reed, P., Sun, Y., Cohen, J., Characklis, G. (2020). "An open source model for quantifying risks in bulk electric power systems from spatially and temporally correlated hydrometeorological processes" Environmental Modelling and Software. Vol. 126.