Implement VersionReq union, intersection, and simplification#223

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jonhoo wants to merge 6 commits intodtolnay:masterfrom jonhoo:merge-ranges

+421-16

Commits on Dec 8, 2020

First draft of range merging and simplification
Jon Gjengset
committed

Commits on Dec 9, 2020

Document union and intersection
Jon Gjengset
committed
Re-compute n as it may have changed
Jon Gjengset
committed
Add basic union+intersection tests
Jon Gjengset
committed
Make clippy happy
Jon Gjengset
committed
Fix other (unrelated) clippy complaints
Jon Gjengset
committed