NEWS for dupfiles
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Version 5.2, released 2011-01-30
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* Use low-level file descriptors instead of Python file objects for I/O,
  for speed.
* Read data in smaller chunks, for speed. It is usually needless to read
  more than a few kilobytes to find a difference, so any further reading
  is a waste of time.
* Make use of the cliapp framework.
* Make use of distutils for building a package.