Logger Yes/No?

[Gorkowski]

See Issue #552 (we closed it and made this discussion)

If so, could you give me an example of how it is useful for you so that I can start building around it?

The idea was to have warnings saved to a log file so when looking at someone else's simulations it's a quick check if everything is okay. Or setup correctly.

For now it would save errors and warnings when mixin inputs are ignored.