[mlpack-git] [mlpack/mlpack] Remove code redundancy in ns_model_impl.hpp (#674)

[stereomatchingkiss]

>since we would still have to write an operator() for each possible TreeType

Maybe template can help?

```
class ReferenceSet: public boost::static_visitor<void>
{
public:
    template<typename T>
    void operator()(T *tree) const
    {
        tree->ReferenceSet();
    }  
};
```

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