add SURFRAD data reader #590
Description
Add data reader for the NOAA SURFRAD network.
https://www.esrl.noaa.gov/gmd/grad/surfrad/
This should be a new module under the pvlib.iotools subpackage proposed in #272.
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Add data reader for the NOAA SURFRAD network.
https://www.esrl.noaa.gov/gmd/grad/surfrad/
This should be a new module under the pvlib.iotools subpackage proposed in #272.