Mapping country codes to verbose names

[willowo]

Currently TradeMapper only displays the two-letter ISO country code as found in the .csv file. However, it would be much more user friendly if this mapped to full country names e.g. DE -> Germany, CH -> Switzerland.

[foobacca]

The data is in the map data, so we can easily get that.

However some elements might need a redesign for the longer text (eg the hover box)

[foobacca]

Resolved by pull #29 and #32 - we have full names in the filter dropdowns, and in the hover boxes we still use the country codes (to avoid having to accomodate longer text in the restricted space, but if you hover over the country codes it shows you the country name. We might want to review that.

[willowo]

Some country codes (e.g. BB, AN, BH) are displaying the 2 letter code rather than the full name in the drop down, what's the reason for this?