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/arithm.cpp

@@ -43,9 +43,6 @@
 #include <cmath>
 #include <limits>
 #include "gputest.hpp"
-#include "opencv2/core/core.hpp"
-#include "opencv2/imgproc/imgproc.hpp"
-#include "opencv2/highgui/highgui.hpp"
 
 using namespace cv;
 using namespace std;