title: Decompress gz file using R
body: <p>I have used <code>?unzip</code> in the past to get at contents of a zipped file using R.  This time around, I am having a hard time extracting the files from a .gz file which can be found <a href="http://sourceforge.net/projects/chadwick/files/chadwick-0.5/0.5.3/chadwick-0.5.3.tar.gz/download">here</a>.</p>
  
  <p>I have tried <code>?gzfile</code> and <code>?gzcon</code> but have not been able to get it to work.  Any help you can provide will be greatly appreciated.</p>