Make Graph::new(_undirected) const #599
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Graph'snewconstructor was previously notconst, and I can't see why. It is useful to have a value of the type constructable at compile-time, which is whyVec::newand other functions like it instdareconst. These constructors should beconst, so I made this PR to do that. (MSRV note: I wasn't capable of easily finding the MSRV, but this change breaks with any version older than 1.39.)