fixed axiom names;

--- a/src/Pure/axclass.ML	Wed Oct 08 12:15:59 1997 +0200
+++ b/src/Pure/axclass.ML	Thu Oct 09 14:39:44 1997 +0200
@@ -217,7 +217,7 @@
     val intro_axm = Logic.list_implies
       (map inclass super_classes @ map (int_axm o snd) axioms, inclass class);
   in
-    Theory.add_axioms_i ((class ^ "I", intro_axm) :: abs_axioms) thy
+    Theory.add_axioms_i ((raw_class ^ "I", intro_axm) :: abs_axioms) thy
   end;