API discussions

[cdunn2001]

The API may evolve. We can bounce ideas around here.

[cdunn2001]

One idea is to use [Node, Edge] generics everywhere. Then, users can apply whatever attributes they see fit. In C++, templates compile slowly, but Nim compiles generics fast. So I am leaning toward this.

Another idea is to use integers for nodes and let the user keep a hash-table. That's a bit less convenient (though less noisy) but extremely efficient. It would also keep our library simple, which is important for any open-source project. Integer-length might be a compile-time option.