This shipping module is a combination of "Zones Intenational Default (elari)"
and "Shipping rate per product (Joe Janos)" with some addtions to fit my needs
It will have unlimited number of zones (right now is set for two) and the most intrerresting is that you don't have to set the last zone, it will automatically default to all other unlisted countries.
The first zone will take the price for each product from its weight field, the rest of the zones' rates will
be a function of the weight field.