experimental moments implementation (does not work yet)
moments work now and work more or less fast
tuned the speed for OpenCL-based moments (still slower than the single-thread SSE2 CPU code :( )
hopefully fixed test failures and complains from the doc builder
improved performance of moments (on 720p or larger images)
OCL: included ORB featured detector/descriptor extractor.
disabled cv::dft opencl impl for CPU devices
Merge pull request #2076 from ilya-lavrenov:tapi_dft
Merge pull request #2063 from vpisarev:ocl_moments
Merge pull request #2034 from pentschev:ocl_features2d_orb_master