ClassIDs are now actually typeinfo name pointers.

I'll see, next, about the `instanceOf` thing, and going with
more normal RTTI routes.

dw/alignedtextblock.hh

@@ -51,7 +51,7 @@ protected:
    void updateValue ();
 
 public:
-   static int CLASS_ID;
+   static std::intptr_t CLASS_ID;
 
    ~AlignedTextblock();
 };