[mlpack-git] [mlpack] Add OpenMP support to density estimation tree code (#438)

[Ryan Curtin]

As a further comment, I suspect that `std::vector<double> regularizationConstants(prunedSequence.size(), 0);` which will initialize the vector to the right size and fill it with zeros will give the same effect and the runtime will be about the same.  If not, I bet `arma::vec` will.

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