Un-commented `NSApplicationActivationPolicyRegular` argument (in leu of zero) and got rid of problematic dereference

OpenCV 3.0.0 Beta

Sample works with OpenNI2 with minimal code changes (CAP_OPENNI -> CAP_OPENNI2)

Not all parameters are specified for openni::VideoMode, so
"selected" mode can be unsupported for device.
Replace default VideoMode constructor to result of getVideoMode() call.

fixed my_umat(roi).clone() test by disabling poorly aligned ROI's. Real fix of the problem will require a separate branch in UMat::copyTo().

Avoid phi exceed PI/2 to get the negative value of cos(phi).

disable "unwanted" messages

Make Otsu and Triangle algorithms mutually exclusive in cv::threshold code.
Signed-off-by: Miroslav Benes <mbenes@suse.cz>