CIE D65 and CIE 1931 2 degree datasets
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The source metadata for both official datasets identifies Creative Commons
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0):
https://creativecommons.org/licenses/by-sa/4.0/

Sources:
* https://files.cie.co.at/Publications-datasets/CIE_std_illum_D65.csv
* https://files.cie.co.at/Publications-datasets/CIE_xyz_1931_2deg.csv

Attribution: CIE, the International Commission on Illumination.
Retain the official metadata downloaded by tools/galvanised/build_optics.py.
