Intrastat reporting

[pokoli (Sergi Almacellas Abellana)]

@ced

As they are other supra-national group of countries like Mercosur, African Union etc.
I think we could have a module country_??? which permit to define group of countries. I think they should be based on date period.

A new discussion was created to implement such module: Country grouping - #3 by maxx