title: Position of title in a legend using title.adj
body: <p>I'm trying to put the title of my legend into a "centered" position using title.adj for x and y direction. However the title shows twice (once in correct position and once in wrong x-position).
  Can anyone please help me removing the second "wrong"-title?
  Here's an example:</p>
  
  <pre><code>plot(c(1,2), pch=20)
  legend("topleft", legend="text", pch=20, col="red", title="double-title", title.adj=c(0.4, 0.2))
  </code></pre>