changed InputArray's enumeration constant for UMat, since it may potentially conflict with existing OpenCL module. refactored Kernel's setArg API (now UMat is passed to a kernel as a structure, as Alexander A suggested). removed Kernel's cleanup callback from the external API; now each kernel keeps track of used matrices and they are dereferenced after it's complete.

fixed some bugs in OpenCL branch of UMat implementation; maybe now the tests will finally pass?! (please ;( )

removed refcount field from Mat; that helped to find and eliminate some memory leaks. perf tests should probably pass now

Need to go back at some point and fix this for real.

Newer FFmpeg prohibits 4096x4096 MPEG-2, presumably because it violates
the standard.

http://git.videolan.org/gitweb.cgi/ffmpeg.git/?p=ffmpeg.git;a=commit;h=7fb87bc5f24b1be13269109506c05e4c54695b5e

This should actually remove the need for the workaround from
the previous commit.

Odd that it wasn't merged automatically...

hopefully, fixed compile errors on Win & Linux; fixed getMatVector() so core & imgproc tests now pass; fixed doc builder errors

Conflicts:
	apps/CMakeLists.txt
	modules/contrib/CMakeLists.txt
	modules/core/include/opencv2/core/version.hpp
	modules/imgproc/include/opencv2/imgproc/imgproc.hpp
	modules/java/generator/gen_java.py
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/src/cl_runtime/cl_runtime.cpp
	modules/ocl/src/columnsum.cpp
	modules/ocl/src/filtering.cpp
	modules/ocl/src/imgproc.cpp
	modules/ocl/test/main.cpp
	modules/ocl/test/test_color.cpp
	modules/ocl/test/test_imgproc.cpp
	samples/gpu/CMakeLists.txt