public function overviewAction()
    {
        $roles = array();

        foreach ($this->acl->getRolePrivileges() as $role => $privileges) {
            $roles[$role][$this->_('Role')]    = $role;
            $roles[$role][$this->_('Parents')] = $privileges[\MUtil_Acl::PARENTS]   ? implode(', ', $privileges[\MUtil_Acl::PARENTS])   : null;
            $roles[$role][$this->_('Allowed')] = $privileges[\Zend_Acl::TYPE_ALLOW] ? implode(', ', $privileges[\Zend_Acl::TYPE_ALLOW]) : null;
            //$roles[$role][$this->_('Denied')]  = $privileges[\Zend_Acl::TYPE_DENY]  ? implode(', ', $privileges[\Zend_Acl::TYPE_DENY])  : null;
            $roles[$role][$this->_('Inherited')] = $privileges[\MUtil_Acl::INHERITED][\Zend_Acl::TYPE_ALLOW] ? implode(', ', $privileges[\MUtil_Acl::INHERITED][\Zend_Acl::TYPE_ALLOW]) : null;
            //$roles[$role][$this->_('Parent denied')]  = $privileges[\MUtil_Acl::INHERITED][\Zend_Acl::TYPE_DENY]  ? implode(', ', $privileges[\MUtil_Acl::INHERITED][\Zend_Acl::TYPE_DENY])  : null;
        }
        ksort($roles);

        $this->html->h2($this->_('Project role overview'));

        $this->_showTable($this->_('Roles'), $roles, true);
    }