Changes:
- L.KML plugin dropped in favor of the native GeoJSON layer in LeafletJS
- Weather data is retrieved even when the user selects a map zoom below the threshold limit (previously no data retrieval and warning displayed). The data is retrieved with a lower density (using the minDegreeDistance parameter)
- GoogleMap pushpins replaced by letter div icons that allow a quick overview of the flight conditions, even for color-blind people
- Collapsed legend added to the map, through the leaflet.legend plugin (JJ Jin)
- List of country codes is now an xml file (with its associated xsl stylesheet for display purposes)