Pycountry quality control

[ddebarros-mapaction]

We're using pycountry to retrieve iso codes but I've seen some bugs when using fuzzy search. We should do some analysis on the limits and add exceptions before the final version.

Some examples:

• pycountry.countries.search_fuzzy('Niger')[0] returns Nigeria instead of Niger
  -pycountry.countries.search_fuzzy('The Democratic Republic of the Congo') returns an error message (the country is stored as 'Congo, The Democratic Republic of the')

[ddebarros-mapaction]

Pycountry fuzzy search function doesn't seem to be reliable enough. To be replaced by a country table column containing a list of ISO3 codes and alternative country names for each country