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.)

Lib/test/test_dis.py

@@ -8,7 +8,7 @@ import StringIO
 import unittest
 
 def _f(a):
-    print a
+    print(a)
     return 1
 
 dis_f = """\