/**
* Unassigns a role-permission relation
*
* @param integer Id of the Role
* @param integer Id of the Permission
* @return boolean
*/
public function unassign($Role, $Permission)
{
$roles = new RoleManager($this->cfg);
$roleId = $roles->returnId($Role);
$permId = $this->returnId($Permission);
$res = $this->dmap->unassign($roleId, $permId);
return $res['success'];
}