trying to guess and fix strange failure in core test

fixed several compile errors/warnings; reacted on the PR comments

fixed many bugs related to Mat::getUMat(), asynchronous kernel execution etc. Also, played a bit with ocl::cvtColor vs cv::cvtColor performance

Merge pull request #1878 from ilya-lavrenov:ocl_resize_area_master

added cv::resize INTER_AREA to T-API

Merge pull request #1880 from ilya-lavrenov:tapi_cvtColor

Merge pull request #1874 from SpecLad:merge-2.4

restored ocl_cvtcolor.cl

RGBA <-> mRGBA

RGB[A] <-> HLS

RGB[A] <-> HSV

BGR5x5 <-> Gray

RGB[A] <- RGB5x5

RGB[A] -> RGB5x5

RGB[A] <-> BGR[A]

RGB[A] <-> XYZ

RGB[A] <-> XYZ

YCrCb -> RGB[A]

Merge pull request #1867 from ilya-lavrenov:ocl_resize_master

Merge pull request #1869 from ilya-lavrenov:ocl_cvtColor_master

fixed cv::cvtColor

Fixed build errors.

fixed ocl::resize (INTER_LINEAR) and added an accuracy test

Merge pull request #1866 from ilya-lavrenov:ocl_fix2

Merge pull request #1868 from KonstantinMatskevich:umat_bugfix

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

Conflicts:
modules/ocl/src/arithm.cpp

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

Conflicts:
.gitignore
CMakeLists.txt
doc/CMakeLists.txt
modules/calib3d/src/stereosgbm.cpp
modules/core/include/opencv2/core/mat.hpp
modules/highgui/src/cap_openni.cpp
modules/ml/include/opencv2/ml/ml.hpp
modules/objdetect/src/hog.cpp
modules/ocl/perf/perf_color.cpp
modules/ocl/src/arithm.cpp
modules/ocl/src/filtering.cpp
modules/ocl/src/imgproc.cpp
modules/ocl/src/optical_flow_farneback.cpp
platforms/scripts/camera_build.conf
platforms/scripts/cmake_android_all_cameras.py
samples/cpp/Qt_sample/main.cpp
samples/cpp/tutorial_code/introduction/windows_visual_studio_Opencv/Test.cpp

Merge pull request #1863 from nevion:master

Merge pull request #1818 from GregoryMorse:patch-2

Merge pull request #1835 from SpecLad:windows-xadd

Merge pull request #1859 from SpecLad:string-plus-equals

Update system.cpp

Fixed to use native C++ instead of C++/CX although it does require significantly more code, it goes along with the spirit of keeping the project in native C++

Update system.cpp

Cleaned up whitespace, removed redundant code and added edge cases for string cleanup

Update system.cpp

Fixed compiler warning over comma operator clause

Update system.cpp

NULL initialization

Update system.cpp

Fixed use of WindowsGetStringRawBuffer which returns internal pointer to buffer

Update system.cpp

Support C++/CX and native C++ through conditional compilation.  Fixed style - long lines, comma operators, long conditional.  Optimized string usage to use reference.

Update system.cpp

Fixed conditional compilation around include and library

Update system.cpp

Fixed trailing space

Update system.cpp

Cleaned up whitespace, removed redundant code and added edge cases for string cleanup

Update system.cpp

Fixed compiler warning over comma operator clause

Update system.cpp

NULL initialization

Update system.cpp

Fixed use of WindowsGetStringRawBuffer which returns internal pointer to buffer

Update system.cpp

Support C++/CX and native C++ through conditional compilation.  Fixed style - long lines, comma operators, long conditional.  Optimized string usage to use reference.

Update system.cpp

Fixed conditional compilation around include and library

Update system.cpp

Fixed trailing space

cp test_colot.cpp to imgproc ocl tests

bugfix in deallocate

fixed ocl_arithm_op; fix for 3-channel images is needed

Merge pull request #1842 from StevenPuttemans:bugfix_3315

Merge pull request #1822 from SpecLad:msvc12

Merge pull request #1837 from asmorkalov:android_opencl

Merge pull request #1839 from pmiecielica:memory_leaks

Merge pull request #1864 from berak:mouse_and_match

Merge pull request #1850 from ilya-lavrenov:pthread_mutex

Merge pull request #1860 from alalek:ocl_fix_undef_warn

mouse_and_match.py missing import cv2

correct upper bound for maximum number of labels for 8-way connectivity

Merge pull request #1862 from alalek:ocl_disable_tests

ocl: disable tests

Merge pull request #1857 from alalek:ocl_ta_tests_infra

Merge pull request #1861 from ilya-lavrenov:ocl_args_fix

fixed error in setting kernel arguments

ocl/core: added prototype for tests

Merge pull request #1853 from StevenPuttemans:bugfix_3346

ocl: don't disable Undef warnings

ocl: fix cl_platform.h:95: #elif _WIN32 -> #elif defined(_WIN32)

Merge pull request #1854 from asmorkalov:android_engine_tegra4i5

Replaced most of the instances of "s = s +" with "s +=".

This resynchronizes master code with 2.4. I say "most", because I might
have missed some due to different spacing; I'll deal with those
instances later if I find them.

Gave cv::String appropriate += operators.

Note that since String is a reference to an immutable string,
this doesn't actually change the string; it just replaces *this
with a reference to the concatenated string.

recursive mutex for linux

Added pointer initialization

Some hacks to build and run OpenCL on Qualcomm S800.

Some of functions were enabled on Qualcomm S800 by changing grid size;
OpenCL kernel grid size unification for different platfroms;
Test pass rate improvements by inclreasing threshold;
Some tests were disabled for Android;
run.py was adopted for devices with brackets in in name.

VFPv4 detection implemented. Some Tegra5 related updates.

Merge pull request #1852 from ilya-lavrenov:ocl_retina

Wrong example at the visual studio tutorial. Fixed link, fixed sample
content and renamed to a more sensible name. Also fixed a wrong link in the
actual display_image tutorial.

Fixed bug in report #3346

changed eps in Retina_OCL test

Package selection for Tegra 4i fixed. Initial Tegra5 support added.

Fixes of some memory leaks

Merge pull request #1847 from ilya-lavrenov:ocl_imgproc_fix

Merge pull request #1848 from ilya-lavrenov:warn

eliminated warning C4267

fixed kernel compilation in imgproc module

Merge pull request #1840 from ilya-lavrenov:ocl_cvtColor

Merge pull request #1841 from ilya-lavrenov:ocl_kernel_compilation

Merge pull request #1838 from alekcac:ios64_fix

fixed kernel compilation

added extra parameters to ocl::cvtColor performance test

Merge pull request #1795 from alalek:perf_report_progress

Merge pull request #1776 from philippefoubert:merge_upstream_2.4_ximea

Merge pull request #1834 from SpecLad:svm-copy-ctor

perf report: summary.py: added --progress mode

Merge pull request #1824 from vpisarev:ocl_experiments5

Merge pull request #1836 from ilya-lavrenov:ocl_norm_workaround

fix for supporting 64-bit architecture

Merge pull request #1833 from SpecLad:fix-qt-sample

Merge pull request #1828 from SpecLad:merge-2.4

Merge pull request #1829 from SpecLad:config-components-libs

workaround for AMD bug: UNREACHABLE EXECUTED

Gave CvSVM a private copy constructor & assignment operator.

The implicitly generated ones don't work properly, and I don't want to
write proper ones. :-)

"Fixes" <http://code.opencv.org/issues/3358>.

Fix the Qt sample, broken after #1722.

Simplified the Windows implementation of CV_XADD.

_InterlockedExchangeAdd is a Visual Studio intrinsic that's available
for all architectures and in all VS versions that we care about. It's also
faster than the underscore-less function, since it's an intrinsic.
We also don't need to declare it ourselves.

It is, however, a Visual Studio-specific intrinsic, so I changed the
preprocessing condition accordingly.

Fixes <http://code.opencv.org/issues/3365>.

Merge pull request #1761 from bhuroc:qtkit-video-file-2.4

Merge pull request #1816 from SpecLad:no-more-epoch

Merge pull request #1830 from SpecLad:config-includes

fixed bug with cl_long size on Win32 (thanks to Aaron Kunze)

fixed failure in Tonemap test

Back to the previous coding way (using the macro with the goto).

In the example in OpenCVConfig.cmake.in, explicitly add the include paths.

After #1801, the include directories are no longer added automatically,
so we should show the user how to do that.

In OpenCVConfig.cmake.in, lowercased the commands in the example.

This is the preferred style nowadays, and more consistent with the
rest of the code.

Fixed OpenCV_LIBS when find_package has been used with explicit components.

Fixes <http://answers.opencv.org/question/23997/opencv-247-cmake-includes-all-modules-even-if-i/>.

Merge pull request #1819 from ilya-lavrenov:ocl_resize_AREA

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

Conflicts:
modules/ocl/include/opencv2/ocl/ocl.hpp
modules/ocl/src/arithm.cpp
modules/ocl/src/build_warps.cpp
modules/ocl/src/color.cpp
modules/ocl/src/haar.cpp
modules/ocl/src/imgproc.cpp
modules/ocl/src/split_merge.cpp
modules/ocl/test/test_color.cpp
samples/cpp/3calibration.cpp
samples/cpp/OpenEXRimages_HDR_Retina_toneMapping.cpp
samples/cpp/OpenEXRimages_HDR_Retina_toneMapping_video.cpp
samples/cpp/Qt_sample/main.cpp
samples/cpp/camshiftdemo.cpp
samples/cpp/descriptor_extractor_matcher.cpp
samples/cpp/distrans.cpp
samples/cpp/generic_descriptor_match.cpp
samples/cpp/grabcut.cpp
samples/cpp/morphology2.cpp
samples/cpp/segment_objects.cpp
samples/cpp/stereo_calib.cpp
samples/cpp/tutorial_code/Histograms_Matching/compareHist_Demo.cpp
samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp
samples/cpp/tutorial_code/introduction/display_image/display_image.cpp
samples/cpp/tutorial_code/introduction/windows_visual_studio_Opencv/Test.cpp
samples/cpp/tutorial_code/objectDetection/objectDetection.cpp
samples/cpp/tutorial_code/objectDetection/objectDetection2.cpp
samples/cpp/video_dmtx.cpp