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Merge branch 'for_pr' of https://github.com/f-morozov/opencv into for_pr

Conflicts:
	modules/photo/doc/hdr_imaging.rst
	modules/photo/include/opencv2/photo.hpp
	modules/photo/src/align.cpp
	modules/photo/src/merge.cpp
	modules/photo/src/tonemap.cpp
	modules/photo/test/test_hdr.cpp
	samples/cpp/tutorial_code/photo/hdr_imaging/hdr_imaging.cpp
Merge branch 'for_pr' of https://github.com/f-morozov/opencv into for_pr

Conflicts:
	modules/highgui/src/rgbe.cpp
remove trailing whitespaces
remove trailing whitespaces
remove trailing whitespaces