title: reshaping a matrix failed in OpenCV 2.4.3
body: <p>I am using OpenCV 2.4.3 to create and reshape a matrix like this: </p>
  
  <pre><code>cv::Mat testMat = cv::Mat::zeros ( 500, 200, CV_8UC3 );
  std::cout &lt;&lt; "size of testMat: " &lt;&lt; testMat.rows &lt;&lt; " x " &lt;&lt; testMat.cols &lt;&lt; std::endl;
  
  testMat.reshape ( 0, 1 );
  std::cout &lt;&lt; " size of reshaped testMat: " &lt;&lt; testMat.rows &lt;&lt; " x " &lt;&lt; testMat.cols &lt;&lt; std::endl;
  </code></pre>
  
  <p>Then from the output, I see there is no change for the reshaped testMat. I used "reshape" many times in older version of OpenCV, but with this new version, I couldn't see any changes. Is this a bug? Or am I using it incorrectly here? </p>