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Cover the double taxation rules and tax treaties for dividends payments - the country of origin for a dividend is determinated by looking at its currency, this is not perfect but works most of the time (will not work for example for all EU countries using the same currency - this will need to be handled later on separately).
I've added a simple validation check which compares the tax at source with a one expected for the detected country which should remove (but not fix) some of the invalid matches.
The code will generate a similar pdf report as for capital gains. Right now only treaty with US and Poland are added to the calculations.