Script to prepare input data for bias correction

[JohnVolk]

Script will read the input list of climate stations that the user provides and the GridMET master CSV file

etr-biascorrect/gridmet_cell_data.csv

and combine information from both in order to conduct bias correction on ETr later. Specifically the climate station list will be updated with the nearest overlapping GridMET cell using their respective locations in decimal degrees. The output table will include the following column headers:

                                    ['GRIDMET_ID',
                                     'LAT',
                                     'LON',
                                     'ELEV_M',
                                     'FID',
                                     'STATION_LAT',
                                     'STATION_LON',
                                     'STATION_ELEV_M']

where LAT, LON, and ELEV_M refer to the GridMET cell, FID refers to the climate station.