[mlpack-git] [mlpack/mlpack] Use move semantics to set a given reference tree in NeighborSearch class. (#765)

[MarcosPividori]

Hi @rcurtin ,
I have rebased on top of master. Also, I removed the `oldFromNew` parameter. Now, I adopt exactly the same approach than with previous method: `void Train(Tree* referenceTree)`  "when providing a reference tree, the points won't be mapped".
So, I added two `Train()` methods:
```
void Train(Tree& referenceTree); // Copy the reference tree.
void Train(Tree&& referenceTree); // Move the reference tree.
```
What do you think?
Thanks!

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