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

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

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

Also fixed some typos and code alignment
Also adapted tutorial CPP samples
Fixed some identation problems

moved some headers to precomp.hpp

Fixed Viz compilation: removed CV_EXPORTS from cv::viz::Color. The macro forced instantiation of all Matx<double, 4, 1> constructors and triggered StaticAssert there.

Fixed compilation errors: removed using namespace from hpp file. This led to pulling cv::ACCESS_MASK to global namespace where conflict with the same name in 'windows.h'

Epoch is gone; now the version component names in C++ and CMake
are consistent (except REVISION corresponds to PATCH).