added helper methods for debug printing

fixed issue when reading wifi entries within old walk files
worked on earth-registration
added corresponding test-cases
other minor changes

geo/EarthPos.h

@@ -21,6 +21,10 @@ struct EarthPos {
 		;
 	}
 
+	std::string asString() const {
+		return "(lat: " + std::to_string(lat) + "°, lon: " + std::to_string(lon) + "°, alt: " + std::to_string(height) + ")";
+	}
+
 };
 
 #endif // EARTHPOS_H