added notice about the changed behavior of copyMakeBorder in the case of ROI (ticket #1756)
added notice about the changed behavior of copyMakeBorder in the case of ROI (ticket #1756)

opencv/opencv,apavlenko/opencv,apavlenko/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv