add Window flags support. add gs format for img. fix register FB name.

Author: kozinove

modules/highgui/test/test_gui.cpp

@@ -80,9 +80,6 @@ TEST(Highgui_GUI, regression)
 
     EXPECT_NO_THROW(destroyAllWindows());
     ASSERT_NO_THROW(namedWindow(window_name));
-#if defined HAVE_FRAMEBUFFER
-    ASSERT_NO_THROW(resizeWindow(window_name, 800, 600));
-#endif
     const vector<int> channels = {1, 3, 4};
     const vector<int> depths = {CV_8U, CV_8S, CV_16U, CV_16S, CV_32F, CV_64F};
     for(int cn : channels)