Incorporate seasonal to daily disaggregation scheme

[jslanini]

@danbroman is creating a temporal disaggregation scheme using a knn approach for risk-based S&T project. When complete, this should be incorporated to allow users to directly generate daily timestep forecasts suitable for reservoir operations modeling (i.e., RiverWare ops models.)

[tjrocha]

We can also try something relatively simple like what is shown in the link below. I programmed this into usbr/Pisces and seems to work well in mapping/scaling monthly data to a daily time-step.

https://sites.google.com/site/anilacharya/project-and-data-links/streamflow-disaggregation