[mlpack-git] [mlpack/mlpack] RectangleTree::NumDescendants() optimization and some RectangleTree fixes (#711)

[Ryan Curtin]

Thanks, this is a nice improvement.  `NumDescendants()` isn't used everywhere---I can only see its use in some situations for range search, tree-based k-means, and rank-approximate nearest neighbor search.  Still, it is good for `NumDescendants()` to be quick. :)

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