Conflicts:
	3rdparty/libjasper/CMakeLists.txt
	cmake/OpenCVDetectOpenCL.cmake
	modules/calib3d/doc/camera_calibration_and_3d_reconstruction.rst
	modules/imgproc/src/floodfill.cpp
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/src/arithm.cpp
	modules/ocl/src/haar.cpp
	modules/ocl/src/imgproc.cpp
	modules/ocl/src/initialization.cpp
	modules/ocl/src/matrix_operations.cpp
	modules/ocl/src/mcwutil.cpp
	modules/ocl/src/opencl/arithm_bitwise_and_mask.cl
	modules/ocl/src/opencl/arithm_bitwise_and_scalar_mask.cl
	modules/ocl/src/opencl/arithm_bitwise_binary_mask.cl
	modules/ocl/src/opencl/arithm_bitwise_binary_scalar.cl
	modules/ocl/src/opencl/arithm_bitwise_binary_scalar_mask.cl
	modules/ocl/src/opencl/arithm_bitwise_or.cl
	modules/ocl/src/opencl/arithm_bitwise_or_scalar.cl
	modules/ocl/src/opencl/arithm_bitwise_or_scalar_mask.cl
	modules/ocl/src/opencl/arithm_bitwise_xor.cl
	modules/ocl/src/opencl/arithm_bitwise_xor_mask.cl
	modules/ocl/src/opencl/arithm_bitwise_xor_scalar.cl
	modules/ocl/src/stereobm.cpp
	modules/ocl/test/precomp.hpp
	modules/python/src2/api
	modules/ts/src/ts_func.cpp
	samples/gpu/bgfg_segm.cpp

Reverts some changes in b8ed00bd

This adds a similar interface with pure-cpp and gpu versions.

Use predefined OpenCL function to convert integers to floating points.
This is more accurate than before as it enables:
1. saturate cast
2. customized rounding