Replaced PolyML specific print function by Display.print_thm(s)

--- a/TFL/casesplit.ML	Tue Oct 19 18:18:45 2004 +0200
+++ b/TFL/casesplit.ML	Tue Oct 19 22:45:20 2004 +0200
@@ -306,9 +306,9 @@
           (case find_thms_split splitths 1 th of 
              None => 
              (writeln "th:";
-              print th; writeln "split ths:";
-             print splitths; writeln "\n--";
-             raise ERROR_MESSAGE "splitto: cannot find variable to split on")
+              Display.print_thm th; writeln "split ths:";
+              Display.print_thms splitths; writeln "\n--";
+              raise ERROR_MESSAGE "splitto: cannot find variable to split on")
             | Some v => 
              let 
                val gt = Data.dest_Trueprop (nth_elem(0, Thm.prems_of th));