Add a new API to retrieve both nearest indices and distances #16
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Hello, thank you for your clean and concise implementation of kd-trees which does not rely on bigger libraries.
Sometimes when querying trees it might be useful to retrieve both indices and distances of points like SciPy does.
I added a new API to your implementation starting from your code, but you could also return both a standard, without adding a new primitive (even though this may break compatibility).