config: add copyright and license header

mercurial/config.py

@@ -1,3 +1,10 b''
+# config.py - configuration parsing for Mercurial
+#
+#  Copyright 2009 Matt Mackall <[e-mail]> and others
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
+
 from i18n import _
 import re, error, os