public function listarclientesAction()
 {
     $modelo = new Application_Model_DbTable_Usuarios();
     $clientes = $modelo->todoslosclientes();
     Zend_View_Helper_PaginationControl::setDefaultViewPartial('paginator/items.phtml');
     $paginator = Zend_Paginator::factory($clientes);
     if ($this->_hasParam('page')) {
         $paginator->setCurrentPageNumber($this->_getParam('page'));
     }
     $this->view->paginator = $paginator;
 }