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

the output of BroxOpticalFlow differs a bit in CUDA 5.5

old version isn't compiled with CUDA 5.5
new version doesn't depend on functional.hpp

removed -fvisibility-inlines-hidden compiler option for CUDA sources

Also, removing explicit include path configuration,
since QT_USE_FILE takes care of that.

The bug is a buffer overrun when border type is reflect101.
It is found that gfft crashed with input of size 100x100 on Intel CPU.

We don't really need it, it makes the code longer, and it can lead to
inconsistent paths when OpenCV is itself inside a symlink.

changed line281 -> line220
Presentation:
because line 220 give the globle var mDetectorType,and in line 230 it will be compared with mDeteorType !!!  it will never be unequal ~
fix:
change mDetectorType(previous globle var) to a new local val tmpDetectorType

Pull requests:
	#943 from jet47:cuda-5.5-support
	#944 from jet47:cmake-2.8.11-cuda-fix
	#912 from SpecLad:contributing
	#934 from SpecLad:parallel-for
	#931 from jet47:gpu-test-fixes
	#932 from bitwangyaoyao:2.4_fixBFM
	#918 from bitwangyaoyao:2.4_samples
	#924 from pengx17:2.4_arithm_fix
	#925 from pengx17:2.4_canny_tmp_fix
	#927 from bitwangyaoyao:2.4_perf
	#930 from pengx17:2.4_haar_ext
	#928 from apavlenko:bugfix_3027
	#920 from asmorkalov:android_move
	#910 from pengx17:2.4_oclgfft
	#913 from janm399:2.4
	#916 from bitwangyaoyao:2.4_fixPyrLK
	#919 from abidrahmank:2.4
	#923 from pengx17:2.4_macfix

Conflicts:
	modules/calib3d/src/stereobm.cpp
	modules/features2d/src/detectors.cpp
	modules/gpu/src/error.cpp
	modules/gpu/src/precomp.hpp
	modules/imgproc/src/distransform.cpp
	modules/imgproc/src/morph.cpp
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/perf/perf_color.cpp
	modules/ocl/perf/perf_imgproc.cpp
	modules/ocl/perf/perf_match_template.cpp
	modules/ocl/perf/precomp.cpp
	modules/ocl/perf/precomp.hpp
	modules/ocl/src/arithm.cpp
	modules/ocl/src/canny.cpp
	modules/ocl/src/filtering.cpp
	modules/ocl/src/haar.cpp
	modules/ocl/src/hog.cpp
	modules/ocl/src/imgproc.cpp
	modules/ocl/src/opencl/haarobjectdetect.cl
	modules/ocl/src/pyrlk.cpp
	modules/video/src/bgfg_gaussmix2.cpp
	modules/video/src/lkpyramid.cpp
	platforms/linux/scripts/cmake_arm_gnueabi_hardfp.sh
	platforms/linux/scripts/cmake_arm_gnueabi_softfp.sh
	platforms/scripts/ABI_compat_generator.py
	samples/ocl/facedetect.cpp

small matrix becomes the same after shuffling