Do not install an own message-handler to prevent double-debug-output in

linux-journals.

UpdatePTUDevCtrl/main.cpp

@@ -62,7 +62,8 @@ int main(int argc, char *argv[]) {
     QApplication::setApplicationVersion(APP_VERSION);
 
     if (!messageHandlerInstalled()) { // change internal qt-QDebug-handling
-        atbInstallMessageHandler(atbDebugOutput);
+        atbInstallMessageHandler(nullptr);
+        //atbInstallMessageHandler(atbDebugOutput);
         setDebugLevel(LOG_NOTICE);
     }