Var/JSON changes

- JSON support for Dynamic Struct and Array
- added VarIterator
- modified behavior of empty Var

JSON/testsuite/src/JSONTest.h

@@ -75,6 +75,7 @@ public:
 	void testDoubleElement();
 	void testOptValue();
 	void testQuery();
+	void testComment();
 	void testPrintHandler();
 	void testStringify();
 	void testStringifyPreserveOrder();