New functions with QT GUI:

- aspectRatio is controled by cvSet/getWindowProperty

modules/highgui/include/opencv2/highgui/highgui_c.h

@@ -80,8 +80,11 @@ enum
 {
 	CV_WND_PROP_FULLSCREEN = 0,
 	CV_WND_PROP_AUTOSIZE   = 1,
+	CV_WND_PROP_ASPECTRATIO= 2,
 	CV_WINDOW_NORMAL       = 0,
-	CV_WINDOW_FULLSCREEN   = 1
+	CV_WINDOW_FULLSCREEN   = 1,
+	CV_WINDOW_FREERATIO	   = 0,
+	CV_WINDOW_KEEPRATIO    = 1
 };