Fix most trivially-findable print statements.

There's one major and one minor category still unfixed:
doctests are the major category (and I hope to be able to augment the
refactoring tool to refactor bona fide doctests soon);
other code generating print statements in strings is the minor category.

(Oh, and I don't know if the compiler package works.)
diff --git a/Lib/test/test_userdict.py b/Lib/test/test_userdict.py
index 25aa307..a7fc60a 100644
--- a/Lib/test/test_userdict.py
+++ b/Lib/test/test_userdict.py
@@ -79,7 +79,7 @@
         self.assertEqual(u2b, u2c)
 
         class MyUserDict(UserDict.UserDict):
-            def display(self): print self
+            def display(self): print(self)
 
         m2 = MyUserDict(u2)
         m2a = m2.copy()