SAM CSV files output by `make_SAM_files` method no longer work in SAM

[ppinchuk]

Need to update to the new WTK format that SAM is using:

https://github.com/NREL/ssc/blob/d26f522f4f64a8e3aefc94143fcff60e1b222629/shared/lib_windfile.cpp#L467-L471