A3t::findIdSequence

- Added support for ID ranges and lists.  Creates a min/max range instead of
  enumerating all IDs, which is an improvement.
- Extended test script.

src/parser/A3t.h

@@ -51,6 +51,7 @@ private:
   void findTag ();
   void findAttribute ();
   void findAttributeModifier ();
+  void findIdSequence ();
   void validate ();
 
 private: