Use the new microseconds function in main loop

Replace units of milliseconds by microseconds

prog/sources/setup-loop.cpp

@@ -30,7 +30,7 @@ void setup (USER_MODE) {
 void loop (USER_MODE) {
 	if (gPerformCount) {
 		incrementations(MODE);
-		if (5000 <= millis (MODE)) {
+		if (5000000 <= micros (MODE)) {
 			gPerformCount = false ;
 			gotoLineColumn (MODE_ 0, 0) ;
 			printUnsigned (MODE_ gCount1) ;