Merge remote-tracking branch 'origin/2.4' into merge-2.4

Merge remote-tracking branch 'origin/2.4' into merge-2.4

Conflicts:
	cmake/OpenCVDetectCUDA.cmake
	modules/core/include/opencv2/core/version.hpp
	modules/cudacodec/src/ffmpeg_video_source.cpp
	modules/gpu/src/video_writer.cpp
	modules/highgui/test/test_ffmpeg.cpp
	modules/highgui/test/test_video_io.cpp
	modules/highgui/test/test_video_pos.cpp
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/include/opencv2/ocl/private/util.hpp
	modules/ocl/src/arithm.cpp
	modules/ocl/src/blend.cpp
	modules/ocl/src/canny.cpp
	modules/ocl/src/cl_operations.cpp
	modules/ocl/src/filtering.cpp
	modules/ocl/src/haar.cpp
	modules/ocl/src/imgproc.cpp
	modules/ocl/src/kmeans.cpp
	modules/ocl/src/moments.cpp
	modules/ocl/src/safe_call.hpp
	modules/ocl/src/split_merge.cpp
	modules/ocl/test/test_moments.cpp
	samples/ocl/squares.cpp