[issue17005] Add a topological sort algorithm

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> If your alternative isn't equally easy to use in a parallelized
> context, I'll be at best +0.

We may need two versions then, a full-featured TopologicalSorter() class and a simple tsort() function that doesn't aspire to be all things to all people.

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