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_atexit.py b/Lib/test/test_atexit.py
index 684d607..9d1e003 100644
--- a/Lib/test/test_atexit.py
+++ b/Lib/test/test_atexit.py
@@ -75,16 +75,16 @@
 
     ### helpers
     def h1(self):
-        print "h1"
+        print("h1")
 
     def h2(self):
-        print "h2"
+        print("h2")
 
     def h3(self):
-        print "h3"
+        print("h3")
 
     def h4(self, *args, **kwargs):
-        print "h4", args, kwargs
+        print("h4", args, kwargs)
 
     def raise1(self):
         raise TypeError