sorted out dependencies

--- a/src/HOL/Tools/ATP/atp_util.ML	Tue Sep 10 15:56:52 2013 +0200
+++ b/src/HOL/Tools/ATP/atp_util.ML	Tue Sep 10 16:02:02 2013 +0200
@@ -7,6 +7,8 @@
 signature ATP_UTIL =
 sig
   val timestamp : unit -> string
+  val hashw : word * word -> word
+  val hashw_string : string * word -> word
   val hash_string : string -> int
   val chunk_list : int -> 'a list -> 'a list list
   val stringN_of_int : int -> int -> string

--- a/src/HOL/Tools/Nitpick/nitpick_util.ML	Tue Sep 10 15:56:52 2013 +0200
+++ b/src/HOL/Tools/Nitpick/nitpick_util.ML	Tue Sep 10 16:02:02 2013 +0200
@@ -299,9 +299,9 @@
     if maybe_quote s = s then pretty else Pretty.enum "" "\"" "\"" [pretty]
   end
 
-fun hashw_term (t1 $ t2) = hashw (hashw_term t1, hashw_term t2)
-  | hashw_term (Const (s, _)) = hashw_string (s, 0w0)
-  | hashw_term (Free (s, _)) = hashw_string (s, 0w0)
+fun hashw_term (t1 $ t2) = ATP_Util.hashw (hashw_term t1, hashw_term t2)
+  | hashw_term (Const (s, _)) = ATP_Util.hashw_string (s, 0w0)
+  | hashw_term (Free (s, _)) = ATP_Util.hashw_string (s, 0w0)
   | hashw_term _ = 0w0
 
 val hash_term = Word.toInt o hashw_term