Output enhancements

* no more flicker on wave form display while scrolling
* dialing console gets cleared/overwritten correctly
* fixes on stderr output

src/bnetz/main.c

@@ -155,13 +155,13 @@ int main(int argc, char *argv[])
 	if (num_kanal == 1 && num_sounddev == 0)
 		num_sounddev = 1; /* use defualt */
 	if (num_kanal != num_sounddev) {
-		fprintf(stdout, "You need to specify as many sound devices as you have channels.\n");
+		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
 	if (num_kanal == 1 && num_pilot == 0)
 		num_pilot = 1; /* use defualt */
 	if (num_kanal != num_pilot) {
-		fprintf(stdout, "You need to specify as many pilot tone settings as you have channels.\n");
+		fprintf(stderr, "You need to specify as many pilot tone settings as you have channels.\n");
 		exit(0);
 	}