added cv::GFTTDetector
doc fix
Fixed build for samples/cpp/train_HOG.cpp.

get_hogdescriptor_visu is passed img->clone(), which is not usable
as a non-const reference (and it doesn't modify the argument, anyway).
Added returnDFVal parameter to parallel CvSVM::predict function
Added ocl_Mog2
fixed
fixes for defects from code coverity
optimized createHanningWindow
fixed warnings
implemented OpenCL version of cv::accumulate****
fixed
Added result_probabilities parameter to CvNormalBayesClassifier::predict method. Issue #3401
Merge pull request #2214 from cosminBoaca:add_returnDFVal_parallel_predict
Merge pull request #2212 from SpecLad:hog-sample-const-mat
fix memory management problem
fix unintialized fields
added cv::calcHist to T-API (only for CV_8UC1 with 256 bins)
added performance test
some experiments
async