Update to latest version of palette namings

[coatless]

@peterkovesi do you by chance have any update notes as to how the color palettes have changed recently? Anything with respect to the rename of old palettes found in 2018.

I'm seeing a bunch of new names and existing palettes having ~3 decimal places instead of 5 decimal places.

82ec912

[peterkovesi]

In June 2021 I made a number of corrections to the colourmap path specifications. I realised that I had erroneously specified some colourmaps paths as piecewise linear rather than a spline. Visually one generally did not notice much difference but it was certainly not ideal. This would probably account for the most of the differences you are seeing. I think I may also have fixed the output of the palettes to 3 decimal places as anything more is fairly pointless

In Dec 2020 I added a new linear map L20/'Gouldian' which was my attempt to generate something a bit better than MATLAB's Parula. I now use this as my standard linear map. see https://colorcet.com/userguide/index.html#gouldianparula

In November 2020 I added C6, a six colour cyclic map which I find quite attractive. and C7 a new 4 colour cyclic map
See https://colorcet.com/userguide/index.html#cyclic

I think those are the main changes in recent years. Hope that helps

[peterkovesi]

I also added another rainbow map 'R4' which is brighter and superficially more attractive however I do not recommend it. See 'Beware of Vivid Colours' https://colorcet.com/userguide/index.html#rainbow