Update library PHPExcel to version 1.7.3

libraries/PHPExcel/PHPExcel/WorksheetIterator.php

@@ -22,35 +22,20 @@
  * @package    PHPExcel
  * @copyright  Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
  * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
- * @version    1.7.2, 2010-01-11
+ * @version    1.7.3, 2010-05-17
  */
 
 
-/** PHPExcel root directory */
-if (!defined('PHPEXCEL_ROOT')) {
-	/**
-	 * @ignore
-	 */
-	define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../');
-}
-
-/** PHPExcel */
-require_once PHPEXCEL_ROOT . 'PHPExcel.php';
-
-/** PHPExcel_Worksheet */
-require_once PHPEXCEL_ROOT . 'PHPExcel/Worksheet.php';
-
-
 /**
  * PHPExcel_WorksheetIterator
- * 
+ *
  * Used to iterate worksheets in PHPExcel
  *
  * @category   PHPExcel
  * @package    PHPExcel
  * @copyright  Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
  */
-class PHPExcel_WorksheetIterator extends IteratorIterator
+class PHPExcel_WorksheetIterator extends CachingIterator
 {
 	/**
 	 * Spreadsheet to iterate
@@ -58,7 +43,7 @@ class PHPExcel_WorksheetIterator extends IteratorIterator
 	 * @var PHPExcel
 	 */
 	private $_subject;
-	
+
 	/**
 	 * Current iterator position
 	 *
@@ -75,14 +60,14 @@ class PHPExcel_WorksheetIterator extends IteratorIterator
 		// Set subject
 		$this->_subject = $subject;
 	}
-	
+
 	/**
 	 * Destructor
 	 */
 	public function __destruct() {
 		unset($this->_subject);
 	}
-	
+
 	/**
 	 * Rewind iterator
 	 */