title: Porting code to Pharo 2.0
body: <p><a href="http://www.pharo-project.org/pharo-download/release-2-0">Pharo 2.0</a> changed some basic API bits, and I cannot found the new way of doing the following:</p>
  
  <ol>
  <li><code>FileDirectory default directoryNamed: aFolderString.</code></li>
  <li><code>FileDirectory on: aFilename.</code></li>
  <li><code>FileDirectory default assureExistenceOfPath: aString.</code></li>
  <li><code>ReferenceStream on: stream.</code></li>
  </ol>
  
  <p>What would be the new equivalent code? 
  Is there an update guide available describing how to translate or port code?</p>