* Do not rely on Java classes to implement IPathElement.

Implement all necessary features such as href() and getChildElement()
  ourselves instead.
* Add missing classes to class.properties.
* Display actual line numbers in function source macro.

Root/functions.js

@@ -55,5 +55,11 @@ function getApp(name) {
     return appObj;
 }
 
+/**
+ * Method used by Helma path resolution.
+ */
+function getChildElement(name) {
+    return this.getApp(name);
+}