header only library for CUDA programming

Conflicts:
	modules/calib3d/include/opencv2/calib3d/calib3d.hpp
	modules/core/include/opencv2/core/core.hpp
	modules/core/include/opencv2/core/cuda/limits.hpp
	modules/core/include/opencv2/core/internal.hpp
	modules/core/src/matrix.cpp
	modules/nonfree/test/test_features2d.cpp
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/src/hog.cpp
	modules/ocl/test/test_haar.cpp
	modules/ocl/test/test_objdetect.cpp
	modules/ocl/test/test_pyrup.cpp
	modules/ts/src/precomp.hpp
	samples/ocl/facedetect.cpp
	samples/ocl/hog.cpp
	samples/ocl/pyrlk_optical_flow.cpp
	samples/ocl/surf_matcher.cpp

setMouseCallback
createTrackbar

http://www.code.opencv.org/issues/2023

eg:

In [3]: box = ((10,10),(5,5),0)

In [4]: cv2.boxPoints(box)
Out[4]:
array([[  7.5,  12.5],
       [  7.5,   7.5],
       [ 12.5,   7.5],
       [ 12.5,  12.5]], dtype=float32)

glibc defines major and minor macros
which conflict with  gpu::DeviceInfo methods with the same name

* In comparison column headers, switched the order of labels, so that
  it's "to" vs "from".

* When a test was present, but not run successfully, put its status in
  the corresponding cell instead of coloring it gray.

The bug was found that all 3-channel oclMat's were converted to
4-channel oclMat's after using convertTo function.