This statement interferes with regular logging on the client side
where the OpenCV library's outputs cannot be managed by the user
and forcefully print out in the client code. For instance, this
is observed when OpenCV is used as a python library where it is
expected to provide optional loggers instead of direct writes to
stdout.

MatSize::operator()() supports only 2-d matrices.

The following data types for attributes are implemented:
 - int
 - double
 - cv::String
 - cv::InputArray

- Fixed a typo in the help text
- Fixed a typo in a comment line

 - Some test cases are added
 - Two tutorials are written to show how to use it.

to prevent console spam. only outputs errors/ warnings now.