Added --raw CLI argument

Allows for outputting the raw CSV file.

I use this functionality for post-processing the data in my own script (and IMO DKB's CSV is far easier to parse than the QIF format).
Just take a look at the [horrible solution](https://www.libreoffice.org/bugzilla/show_bug.cgi?id=80261) that _libreoffice_ came up with (comment 12)