Changes in upstream CSVs:

New

• C3 - Cyclic: white - red - black - blue
• C6 - "Six colour cyclic with primaries and secondaries matched in lightness"
• C7 - Cyclic Yellow - Magenta - Cyan - Green - Yellow
• L20 - Parula replacement "Gouldian"
• R4 - Rainbow colour map from blue to red

Changed

• D1-D9, L1-L9 renamed to D01-D09, L01-L09
• Floats have higher precision

There actually look to be even more in colorcet.m, I guess that's the ultimate canonical source?

I'm a bit unsure how to integrate these changes into CET_to_py.py, especially the D01-D09 and L01-09 stuff. Or maybe this project keeps the original CSV names?