Update to PEAR 1.7.2, Image_Canvas 0.3.1, Image_Color 1.0.3, Image_Graph 0.7.2, XML_Parser 1.3.1.

Removed PHP_Compat, and references to it.
Removed ionCube/Zend/mmCache compatibility checks in test.php script.
Changed minimum PHP requirement to 5.0 in test.php script.

modules/invoice/invoice.inc.php

@@ -704,7 +704,6 @@ class invoice
 
 		# echo the custom tracking code to the screen:
 		if(!is_file(PATH_FILES.'tracking.txt')) return false;
-		require_once('includes/pear/Compat/Function/file_get_contents.php');
 		$tracking = file_get_contents(PATH_FILES.'tracking.txt');
 		$tracking = ereg_replace('%%amount%%', "$total_amount", $tracking);
 		$tracking = ereg_replace('%%invoice%%', $invoice, $tracking);
@@ -4373,4 +4372,4 @@ class invoice
 		$this->limit	= $construct["construct"]["limit"];
 	}
 } 
-?>
+?>