This change updates the -pc flag, so that a new xterm256 color scheme is
used. This color scheme is believed to be better for three reasons:
1. It should be friendlier to the colorblind. The scheme was designed by
Paul Tol (see: https://personal.sron.nl/~pault/). TensorBoard uses it
since 2017, so it's already popular in the machine learning community
2. It should appear to be the same colors as before to people who aren't
i.e. it's still a red-green spectrum like before but lightly modified
3. It is readable in both white and black background terminals. The neon
colors before were probably a bit too intense for white backgrounds.
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