[mlpack-git] [mlpack/mlpack] Replaced SortStruct by std::pair (#721)

[lozhnikov]

>      }
>    }
>  
> -  std::sort(sorted.begin(), sorted.end(), structComp<ElemType>);
> +  std::sort(sorted.begin(), sorted.end(),
> +      [] (const std::pair<ElemType, size_t>& p1,
> +          const std::pair<ElemType, size_t>& p2)
> +      {
> +        return p1.first < p2.first;
> +      });

I replaced lambdas by a comparator. I define this function in `RStarTreeSplit` and `XTreeSplit`. These classes have a lot of duplicated code, I think we should not create a separate file for the comparator.

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