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* Add a FLANN example showing how to search a query image in a dataset * Clean: remove warning * Replace dependency to boost::filesystem by calls to core/utils/filesystem * Wait for escape key to exit * Add an example of binary descriptors support * Add program options for saving and loading the flann structure * Fix warnings on Win64 * Fix warnings on 3.4 branch still relying on C++03 * Add ctor to img_info structure * Comments modification * * Demo file of FLANN moved and renamed * Fix distances type when using binary vectors in the FLANN example * Rename FLANN example file * Remove dependency of the flann example to opencv_contrib's SURF. * Remove mention of FLANN and other descriptors that aimed at giving hint on the other options * Cleaner program options management * Make waitKey usage minimal in FLANN example * Fix the conditions order * Use cv::Ptr