title: Change font/color for a field in django admin interface if expression is True
body: <p>In change list view in django admin interface, is it possible to mark some fields/rows red in  if they achieve a expression?</p>
  
  <p>For example, if there is a model <code>Group</code> with <code>members</code> and <code>capacity</code>, how can I visualize when they are <em>full</em> or <em>crowded</em>?</p>