[mlpack] [mlpack/mlpack] Log::Info has incompatibility issue with some iomanip functions (#755)

[Shikhar Bhardwaj]

I had a look through the code in `prefixedoutstream.hpp` and `prefixedoutstream_impl.hpp`.

Converting each output to a string causes the floating-point types to lose the type information needed by the `destination` stream to output the necessary precision.

I could imagine two solutions to the problem

1. Introduce 3 inline template specialisations for `util::prefixedoutstream::BaseLogic` for `float`, `double` and `long double`, each of which directly writes the `val` to the `destination` stream.
2. Use SFINAE on `BaseLogic` to write `val` directly to the `destination` if the type satisfies `std::is_floating_point`.

Any thoughts?

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