xobjdetect documentation

some correction to make xfeature2d compilation work and adding 2d cuda f...

Updated module comment in ximgproc.rst

Remove dependence on optim module

Deepflow implementation (and optical flow testing again)

fixed documentation titles

Now algorithm names are overlayed with image and number of frames
assessed can be given via command line (e.g. -a=100 to assess first 100
frames).

With all functionality preserved. Pure renaming.

Algorithm::info()-related code disabled-after moving to opencv_contrib caused compilation errors

Added usage examples

Added documentation for optflow_io

+bugfix: handling invalid algorithm choice

+ solving MSVC compilation errors; assuming that int and float are 4-bytes long - possibly needs fixing

Additions to ximgproc and xphoto modules

Structured edge detection & State-of-the-art image inpainting

adds class OCRHMMDecoder API interface and implementation and updates webcam_demo sample to use it

Conflicts:
	modules/ximgproc/CMakeLists.txt
	modules/ximgproc/test/test_main.cpp
	modules/ximgproc/test/test_precomp.hpp