Merged pull requests:
	#890 from caorong:patch-1
	#893 from jet47:gpu-arm-fixes
	#933 from pengx17:2.4_macfix_cont
	#935 from pengx17:2.4_filter2d_fix
	#936 from bitwangyaoyao:2.4_perf
	#937 from bitwangyaoyao:2.4_fixPyrLK
	#938 from pengx17:2.4_surf_sample
	#939 from pengx17:2.4_getDevice
	#940 from SpecLad:autolock
	#941 from apavlenko:signed_char
	#946 from bitwangyaoyao:2.4_samples2
	#947 from jet47:fix-gpu-arm-build
	#948 from jet47:cuda-5.5-support
	#952 from SpecLad:jepg
	#953 from jet47:fix-bug-3069
	#955 from SpecLad:symlink
	#957 from pengx17:2.4_fix_corner_detector
	#959 from SpecLad:qt4-build
	#960 from SpecLad:extra-modules

Conflicts:
	modules/core/include/opencv2/core/core.hpp
	modules/gpu/CMakeLists.txt
	modules/gpu/include/opencv2/gpu/device/vec_math.hpp
	modules/gpu/perf/perf_video.cpp
	modules/gpuimgproc/src/cuda/hough.cu
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/src/pyrlk.cpp
	samples/gpu/driver_api_multi.cpp
	samples/gpu/driver_api_stereo_multi.cpp
	samples/ocl/surf_matcher.cpp

also refactored VideoSource interface (made it simplier, now it has only 2 abstract methods)

* converted it to Algorithm, because implementation uses inner buffers and
  requires preprocessing step
* new implementation splits preprocessing and transform,
  what is more effecient
* old API still can be used for source compatibility (marked as deprecated)

Request to comments on pull request for simplex method. In particular
*) while(1) is replaced with for(;;)
*) if(true){...} constructions in tests are replaced with #if 1 ...
 #endif

Added bugfixes
- Changed CV_WINDOW_NORMAL to 1
- Changed the help function to static
- Added extra help information on mask specifics

….8.11): OpenCVConfig.cmake violates the policy CMP0004.

Symptoms:
CMake Error at CMakeLists.txt:10 (add_executable):
Target "my_app" links to item "C:/Program Files " which has leading
or trailing whitespace. This is now an error according to policy CMP0004.

This problem occurs when building on Windows when we depend on libraries located (for example) in "C:\Program Files (x86)..."

Conflicts:
	3rdparty/ffmpeg/ffmpeg_version.cmake
	cmake/OpenCVFindLibsGrfmt.cmake
	cmake/templates/cvconfig.h.cmake
	modules/bioinspired/doc/retina/index.rst
	modules/calib3d/doc/camera_calibration_and_3d_reconstruction.rst
	modules/calib3d/src/precomp.hpp
	modules/contrib/src/inputoutput.cpp
	modules/contrib/src/precomp.hpp
	modules/core/include/opencv2/core/internal.hpp
	modules/core/include/opencv2/core/types_c.h
	modules/core/src/drawing.cpp
	modules/core/src/precomp.hpp
	modules/core/src/system.cpp
	modules/features2d/doc/common_interfaces_of_descriptor_matchers.rst
	modules/features2d/doc/common_interfaces_of_feature_detectors.rst
	modules/features2d/include/opencv2/features2d/features2d.hpp
	modules/features2d/src/precomp.hpp
	modules/flann/src/precomp.hpp
	modules/gpu/doc/camera_calibration_and_3d_reconstruction.rst
	modules/gpu/doc/image_filtering.rst
	modules/gpu/doc/image_processing.rst
	modules/gpu/doc/video.rst
	modules/gpu/perf/perf_imgproc.cpp
	modules/gpu/perf4au/main.cpp
	modules/gpu/src/imgproc.cpp
	modules/gpu/src/precomp.hpp
	modules/gpu/test/test_imgproc.cpp
	modules/highgui/CMakeLists.txt
	modules/highgui/test/test_precomp.hpp
	modules/imgproc/doc/structural_analysis_and_shape_descriptors.rst
	modules/imgproc/src/precomp.hpp
	modules/java/generator/src/cpp/Mat.cpp
	modules/legacy/src/precomp.hpp
	modules/ml/doc/k_nearest_neighbors.rst
	modules/ml/src/precomp.hpp
	modules/nonfree/doc/feature_detection.rst
	modules/nonfree/src/precomp.hpp
	modules/objdetect/include/opencv2/objdetect/objdetect.hpp
	modules/objdetect/src/cascadedetect.cpp
	modules/objdetect/src/hog.cpp
	modules/objdetect/src/precomp.hpp
	modules/objdetect/test/test_latentsvmdetector.cpp
	modules/ocl/src/hog.cpp
	modules/ocl/src/opencl/objdetect_hog.cl
	modules/ocl/src/precomp.hpp
	modules/photo/src/precomp.hpp
	modules/stitching/src/precomp.hpp
	modules/superres/perf/perf_precomp.hpp
	modules/superres/src/optical_flow.cpp
	modules/superres/src/precomp.hpp
	modules/superres/test/test_precomp.hpp
	modules/ts/include/opencv2/ts.hpp
	modules/video/src/precomp.hpp
	modules/videostab/src/precomp.hpp
	modules/world/src/precomp.hpp