title: PyMeasure: ManagedWindow class doesn't contain directory_input argument
body: <p>I'm trying out the latest version 0.8.0 of the PyMeasure package using the examples given in their tutorial from the official documentation. I want to add the directory input to my GUI but I get the error</p>
  <p><em>TypeError: <strong>init</strong>() got an unexpected keyword argument 'directory_input'</em></p>
  <p>when I run my script. Here is the part of the code where I added this feature according to the <a href="https://pymeasure.readthedocs.io/en/latest/tutorial/graphical.html#using-the-directory-input" rel="nofollow noreferrer">documentation</a> on the pymeasure readthedoc site.</p>
  <pre class="lang-py prettyprint-override"><code>class MainWindow(ManagedWindow):
  
      def __init__(self):
          super(MainWindow, self).__init__(
              procedure_class=RandomProcedure,
              inputs=['iterations', 'delay', 'seed'],
              displays=['iterations', 'delay', 'seed'],
              x_axis='Iteration',
              y_axis='Random Number',
              directory_input=True
          )
          self.setWindowTitle('GUI Example')
  
      def queue(self):
          directory = self.directory
          filename = unique_filename(directory)
          #filename = tempfile.mktemp()
          
  
          procedure = self.make_procedure()
          results = Results(procedure, filename)
          experiment = self.new_experiment(results)
  
          self.manager.queue(experiment)
      
      def closeEvent(self,event):
          QtGui.QApplication.quit()
  </code></pre>
  <p>My version check showed that I'm using version 0.8.0, however when I investigated the ManagedWindow class is shows this definition</p>
  <pre class="lang-py prettyprint-override"><code>ManagedWindow(procedure_class, inputs=(), displays=(), x_axis=None, y_axis=None,
  log_channel='', log_level=logging.INFO, parent=None, sequencer=False,
  sequencer_inputs=None, sequence_file=None, inputs_in_scrollarea=False)
  </code></pre>
  <p>which doesn't include the option <em>directory_input</em> as an argument.
  Does anybody have an idea why this is not available although the versions from the documentation and mine are the same?</p>