title: Short options only in boost::program_options
body: <p>How would one go about specifying short options without their long counterparts in boost?</p>
  
  <pre><code>(",w", po::value&lt;int&gt;(), "Perfrom write with N frames")
  </code></pre>
  
  <p>generates this </p>
  
  <pre><code>-w [ -- ] arg : Perfrom write with N frames
  </code></pre>
  
  <p>Any way to specify short options only?</p>