Function `get_country_tiles` should have an option to deliver the tiles sorted by latitude
Finalizer processes all tiles of a country and doing this sorted by latitude makes it easier to identify processing problems and processing completeness. Because Finalizer needs to be modified to accommodate the processing of large countries (see globaldynamicexposure/exposure-finalizer#26 (closed)), it will be best to copy the procedure selected in Initializer to solve the same problem (see globaldynamicexposure/exposure-initializer#32 (closed)). Therefore, Finalizer should call the exposure-ib function get_country_tiles too but should have the option to retrieve the tiles sorted by latitude.