title: Form control to set values of 'multiple' property
body: <p>Alfresco supports model properties that allow multiple values:</p>
  
  <pre><code>&lt;aspect name="aspectName"&gt;
    &lt;title&gt;The Aspect Title&lt;/title&gt;
    &lt;properties&gt;
      &lt;property name="propname"&gt;
        &lt;type&gt;d:text&lt;/type&gt;
        &lt;multiple&gt;true&lt;/multiple&gt;
      &lt;/property&gt;
    &lt;/properties&gt;
  &lt;/aspect&gt;
  </code></pre>
  
  <p>The following <code>share-config-custom.xml</code> snippet renders this property as a single text-field:</p>
  
  <pre><code>&lt;config evaluator="aspect" condition="aspectName"&gt;
    &lt;forms&gt;
      &lt;form&gt;
        &lt;appearance&gt;
          &lt;field id="propname" /&gt;
        &lt;/appearance&gt;
      &lt;/form&gt;
    &lt;/forms&gt;
  &lt;/config&gt;
  </code></pre>
  
  <p>Is there any configuration option to render a control that allows to edit multiple values of the property?</p>
  
  <p>If not, is there a way to render such a control?</p>