Less clever and more useful colouring #24
Merged
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In #23 I got nerd-sniped by a cool graph theory problem, but we do not actually care about distinguishing the independent arcs; we care about telling apart the long ones from the short ones. Colouring random arcs that are part of short cycles in colours that correspond to near-critical cycles is misleading. Also deal with the problem of dark backgrounds by using white text instead of skipping colour 1.
Example on the graph from mockingbirdnest/Principia#4152: