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

[Shikhar Bhardwaj]

Thanks Ryan.

Turns out that just syncing the flags and precision between `destination` and `convert` will be enough, without needing extra overloads.

Printing Armadillo objects with set precision is not possible with this approach AFAICS, as the overloads for `operator<<` called are defined by Armadillo.

Armadillo does provide a `raw_print` method to print without modifying the stream flags but that would require an overload approach on the `baseLogic`(?)

I'll create a PR ASAP with the changes for floating-point types.

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