Merge remote-tracking branch 'origin/topic/bernhard/ticket-1144'

* origin/topic/bernhard/ticket-1144:
  Allow iterating over bif functions with result type vector of any.

BIT-1144 #merged

src/Val.h

@@ -656,6 +656,8 @@ protected:
 	DECLARE_SERIAL(PatternVal);
 };
 
+// ListVals are mainly used to index tables that have more than one 
+// element in their index.
 class ListVal : public Val {
 public:
 	ListVal(TypeTag t);