added magnitudeSqr and rectStdDev to gpu module.

added supports of CV_32SC2 source to gpu scalar arithm and float source to gpu::histRange.
minor fix of gpu tests.

tests/gpu/src/stereo_bm_async.cpp

@@ -40,9 +40,6 @@
 //M*/
 
 #include "gputest.hpp"
-#include "highgui.h"
-#include "cv.h"
-
 
 using namespace cv;
 using namespace std;