Implement QC stage 1: for each admin1 or admin2 location, find the associated GAUL admin unit.
Fix centroids in admin_unit table.
Map GeoNames feature codes "ADMD" and "ADMH" to ADMIN2 rather than ADMIN1.
DataAcquisition now always returns COUNTRY precision if there is no GeoNames ID and the place name is the name of a HealthMap country.