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sss

Added workaround for Nvidia: take into account that 3-channel vector type takes 4*elem_size in local memory.

don't discard pure virtual methods in hdr_parser.py (was broken anyway)

cv::Matx could not be converted to c::Mat automatically

As opencv_xfeatures2d is part of opencv-contrib and not opencv repository,
${OpenCV_SOURCE_DIR}/modules/modules/include is not a correct include
path - use ${opencv_xfeatures2d_SOURCE_DIR}/include instead

The cv::superres::createOptFlow_Simple() function along with the
simple optical flow class implementation is currently commented out
in the superres module's code, so comment it out in the example as well.

The FGD background subtraction model was part of opencv_legacy module;
as it is gone now, it makes little sense to benchmark the GPU version,
either, so the whole test is removed.