Published a small coverage tool.

While working on a rust library bindings task for @dulsi I found Rust test coverage options hard to use.

So I made a tool that runs your tests and gives you test coverage just when you run `testcov` in your crate dir.

Limitations: super unpolished, nightly rust, rustup, rustup's llvm tooling in path, Linux (Mac?)
Also no line-by line display, just aggregate. But better than nothing.

Later, line-by-line support is planned.

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