title: Reverse video cursor in Emacs
body: <p>How do I make the cursor in Emacs a black box with underneath text displayed in white?</p>
  
  <p>like so:<br>
  <img src="https://cobbal.s3.amazonaws.com/drop/reverse.png" alt="reverse cursor"></p>
  
  <p>Screenshot is from the Carbon Emacs package, but I want the same behavior in Cocoa Emacs 23.</p>