title: SelectBooleanCheckbox in editable DataTable doesn't change
body: <p>I have a dataTable that is editable (<code>editMode = "cell"</code>). </p>
  
  <p>Editing free text field and list box is quite straightforward. However, I cannot figure out how to edit checkbox field. To be more specific when I try to edit checkbox selection, the data in the output facet is not actualized after the change was made.</p>
  
  <pre><code>&lt;p:dataTable id="submodels" var="submodel" value="#{projectMB.submodels}" 
               editable="true" editMode="cell" widgetVar="cellSubmodels"&gt;
    &lt;p:column headerText="Mapping file"&gt;
      &lt;p:cellEditor&gt;
        &lt;f:facet name="output"&gt;
          &lt;h:selectBooleanCheckbox value="#{submodel.mapping}" onclick="return false;"
             style="width:96%" label="Root model" readonly="true"/&gt;
        &lt;/f:facet&gt;
        &lt;f:facet name="input"&gt;
          &lt;h:selectBooleanCheckbox value="#{submodel.mapping}" style="width:96%" 
             label="Root model"/&gt;
        &lt;/f:facet&gt;
      &lt;/p:cellEditor&gt;
    &lt;/p:column&gt;
  &lt;/p:dataTable&gt;
  </code></pre>
  
  <p>What is a bit suprising, when I change input facet into inputText (and enter true/false value in it), checkbox is updated properly:</p>
  
  <pre><code>&lt;p:dataTable id="submodels" var="submodel" value="#{projectMB.submodels}" 
               editable="true" editMode="cell" widgetVar="cellSubmodels"&gt;
    &lt;p:column headerText="Mapping file"&gt;
      &lt;p:cellEditor&gt;
        &lt;f:facet name="output"&gt;
          &lt;h:selectBooleanCheckbox value="#{submodel.mapping}" onclick="return false;"
             style="width:96%" label="Root model" readonly="true"/&gt;
        &lt;/f:facet&gt;
        &lt;f:facet name="input"&gt;
          &lt;p:inputText value="#{submodel.mapping}" style="width:96%" /&gt;
        &lt;/f:facet&gt; 
      &lt;/p:cellEditor&gt;
    &lt;/p:column&gt;
  &lt;/p:dataTable&gt;
  </code></pre>
  
  <p>Can you point out what I have done wrong?
  I get no errors in javascript console and on Java server side.</p>
  
  <p>I'm using Primefaces version 4.0</p>