Removed opencv_extra folder inside opencv folder

New changes done

Removed test images

Removed conflict

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Errors fixed

Removed opencv_extra folder inside opencv folder

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All 3 modules Updated

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added test data

Conflicts:
	modules/core/include/opencv2/core/cuda.hpp
	modules/cudacodec/src/thread.cpp
	modules/cudacodec/src/thread.hpp
	modules/superres/perf/perf_superres.cpp
	modules/superres/src/btv_l1_cuda.cpp
	modules/superres/src/optical_flow.cpp
	modules/videostab/src/global_motion.cpp
	modules/videostab/src/inpainting.cpp
	samples/cpp/stitching_detailed.cpp
	samples/cpp/videostab.cpp
	samples/gpu/stereo_multi.cpp

cudev is used for new device layer

Looks like we don't actually use them; when creating precompiled headers
with Visual C++, a dummy .cpp is created at build time.