This adds the possibility to use multi-channel masks for the functions
cv::mean, cv::meanStdDev and the method Mat::setTo. The tests have now a
probability to use multi-channel masks for operations that support them.
This also includes Mat::copyTo, which supported multi-channel masks
before, but there was no test confirming this.

Update miniflann.cpp

Update test_stereomatching.cpp

To reduce number of unnecessary rebuilds on updates of OpenCL kernels

Removing unnecessary range checks for QT backend support's setTrackbarMin and setTrackbarMax fucntions

Fixes

Corrected Typo in Additional Resources Section

Corrected the Typo 'Hasing' to 'Hashing' in second item in Additional Resources section. Also added Wikipedia link for the LSH.

update

add anchor

Setting truncate option for QString leftJustified method to false fixes 10 character truncation issue noted in issue 9489

size_t is not supported cv::Mat type