title: Is there a 'not in' equivalent in GORM?
body: <p>Is this possible to convert in createCriteria()?</p>
  
  <pre><code>SELECT * FROM node WHERE (node.type = 'act' AND nid NOT IN (SELECT nid FROM snbr_act_community)) LIMIT 10
  </code></pre>
  
  <p>I know there's a 'in' operator and here's what I have so far:</p>
  
  <pre><code>def c = VolunteerOpportunity.createCriteria()
  def matchingActs = c.list {
      node {
          eq('type', 'act')
      }
      maxResults(10)
  }
  </code></pre>
  
  <p>Just want to see if this is possible. Otherwise, I guess this is possible in HQL right?</p>