apply some code analyzer recommendations

libs/qt/qcd_view.cpp

@@ -344,7 +344,7 @@ void CDView::cd_receivedX() {
 	X.lock();
 	PIVector<PIDeque<int>> xl = X.enabledList();
 	// piCout << "X" << xl.size();
-	piForeachC(PIDeque<int> & x, xl) {
+	for (const auto & x: xl) {
 		CDType & t(X[x]);
 		// piCout << t;
 		// piCout << t.path();