Original author: me.

Original author: Alex Wilson.

This reverts commit a9975b14, to prepare
for cherry-picking upstream's solution.

Conflicts:
	doc/tutorials/bioinspired/retina_model/retina_model.rst~

Conflicts:
	doc/tutorials/definitions/tocDefinitions.rst

Conflicts:
	doc/tutorials/features2d/feature_detection/feature_detection.rst
	modules/bioinspired/doc/retina/index.rst
	modules/core/include/opencv2/core/core.hpp
	modules/core/include/opencv2/core/mat.hpp
	modules/core/include/opencv2/core/operations.hpp
	modules/core/src/stat.cpp
	modules/features2d/include/opencv2/features2d/features2d.hpp
	modules/imgproc/src/filter.cpp
	modules/legacy/src/dpstereo.cpp
	modules/nonfree/src/surf.ocl.cpp
	modules/ocl/doc/image_processing.rst
	modules/ocl/doc/object_detection.rst
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/include/opencv2/ocl/private/util.hpp
	modules/ocl/src/arithm.cpp
	modules/ocl/src/canny.cpp
	modules/ocl/src/filtering.cpp
	modules/ocl/src/imgproc.cpp
	modules/ocl/src/initialization.cpp
	modules/ocl/src/matrix_operations.cpp
	modules/ocl/src/pyrdown.cpp
	modules/ocl/src/pyrup.cpp
	modules/ocl/src/split_merge.cpp
	modules/ocl/test/test_objdetect.cpp
	modules/ocl/test/utility.hpp

The second parameter of gtk_widget_set_realized is of type gboolean
(gint). This is to ensure compatibility on alternative compilers and
platforms.

Updated documentation and sample to use the new function API

add INSTALL command for TBB target