title: Record file copy operation with Git
body: <p>When I move a file in git using git-mv the status shows that the file has been renamed and even if I alter some portions it still considers to be almost the same thing (which is good because it lets me follow the history of it). </p>
  
  <p>When I copy a file the original file has some history I'd like to associate with the new copy.</p>
  
  <p>I have tried moving the file then trying to re-checkout in the original location - once moved git won't let me checkout the original location.</p>
  
  <p>I have tried doing a filesystem copy and then adding the file - git lists it as a new file.</p>
  
  <p>Is there any way to make git record a file copy operation in a similar way to how it records a file rename/move where the history can be traced back to the original file?</p>