[mlpack-git] [mlpack/mlpack] Descriptive Statistics command-line program (#742)

[Ryan Curtin]

> +    double rowMean = arma::mean(row);
> +    double rowStd = arma::stddev(row, population);
> +
> +    // Print statistics of the given dimension.
> +    Log::Info << boost::format(numberFormat)
> +        % dimension
> +        % arma::var(row, population)
> +        % rowMean
> +        % rowStd
> +        % arma::median(row)
> +        % rowMin
> +        % rowMax
> +        % (rowMax - rowMin) // range
> +        % Skewness(row, rowStd, rowMean, population)
> +        % Kurtosis(row, rowStd, rowMean, population)
> +        % StandardError(row, rowStd) << endl;

Everywhere else in the mlpack code we use just regular iostreams instead of boost::format... is it possible to use iostreams and iomanips here?  Like `std::setw`, etc.

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