New functions with QT GUI:

- 3 new points mostly done:
      - OpenGL support enabled (windows are rendered using GPU)
      - Save current screen (with overlay and so on...) with shortcut CTRL+S
      - Text rendering (with any system font, and possibility to set the style - normal, italic,... - the weight - normal, bold, ... - the color, the spacing between letters, and so on...)

modules/highgui/src/precomp.hpp

@@ -170,7 +170,6 @@ void cvSetModeWindow_W32(const char* name, double prop_value);
 void cvSetModeWindow_GTK(const char* name, double prop_value);
 void cvSetModeWindow_CARBON(const char* name, double prop_value);
 
-
 //for QT
 #if defined (HAVE_QT)
 double cvGetModeWindow_QT(const char* name);