Plat 726 geo dist

geo:dist native function integration
   - AfsQuery::set/remove_geoDist_filter/sort
   - new AfsQuery private methods for futur native function integration
     (AfsQuery::set_native_function_filter/sort() and AfsQuery::remove_native_function_filter/sort())
Accessor to geolocation data in reply stream (see AfsReplySetHelper::get_geo_data())