Make use of US, CA and MX geographical data (requested by OCNA)

[andrixnet]

OCNA serves North America, that is USA, Canada and Mexico.

Geographical data on these is split across several tables.

IMHO there are two ways of handling it:

1. import OCNA specific code into OCPL-current and activate it only for OCNA node
2. process geographical data and convert it into nuts_codes and nuts_layer compatible data, then use existing code to handle it.
3. a combination of the above, given that US data may have more usable database fields and offer more features then just nuts data.

I have compiled and attached what I believe is the relevant database contents for this geographical data.

ca_province.zip
geographical_definitions.zip
mx_states.zip
us_state_c.zip

[kojoty]

I think we need to consider if the best option is not to use just external service which provide Geo data for the whole world.