[mlpack-git] [mlpack/mlpack] Vantage point tree (#708)

[lozhnikov]

The inner radius of the outer child may be equal to zero due to the following code
```
  VantagePointTree* tree = this;

  while (tree->Parent() != NULL)
  {
    tree->Parent()->Bound() |= tree->Bound();
    tree->Parent()->furthestDescendantDistance = 0.5 *
			tree->Parent()->Bound().Diameter();
    tree = tree->Parent();
  }
```
(we have to ensure that each parent contains its children), there is no errors.

It seems I do not use `FirstSiblingFirstPointIsCentroid` correctly. I have to think about it.

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