title: ISPConfig change "Document Root" for specific domain
body: <p>How to change the <code>Document Root</code> for a specific domain/subdomain inside ISPConfig 3.</p>
  
  <p>I need to point my subdomain to a different directory than the standard <code>client3</code> <code>web6</code> roots.</p>
  
  <p>And in "ISPConfig 3" this field isn't editable, neither during creation nor afterwards. </p>