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

[Ryan Curtin]

Hi Shikhar,

Thanks for looking into this.  I think the second approach is the right one to use here.  Since there should never be a newline printed as a result of printing a number, you can probably simplify the overload of `BaseLogic` greatly, too.

One thing to check will be that `std::fixed` and `std::setprecision` work with Armadillo objects, like this:

```
arma::mat m;
m.randu(5, 5);
Log::Info << std::setprecision(10) << m;
```

But even if that does not, just a patch for floating-point types only will still be a great help!

Thanks,
Ryan

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