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Having a go at issue #52
Adds a command line parameter --override_currency="YOUR_CURRENCY" which is then set as the currency for the print out. It also supports --override_currency="" which is my use case, where all my entries to date simply don't have a currency and that's the way I like them.
I think this is roughly following the conventions for how you've got for new code. I tried to write up a test, but the truth is I haven't been able to successfully run the test suite on my local machine, so I'm not sure if it'll pass although I think it looks about right...