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.

includes/pear/PEAR/FixPHP5PEARWarnings.php

@@ -0,0 +1,7 @@
+<?php
+if ($skipmsg) {
+    $a = &new $ec($code, $mode, $options, $userinfo);
+} else {
+    $a = &new $ec($message, $code, $mode, $options, $userinfo);
+}
+?>