Update copyright years, and change copyright.tex to use the same spelling

as license.tex (SF patch 795531 complained about the spelling discrepancy,
although this "repairs" that flaw in a different way than the patch).

Doc/commontex/copyright.tex

-Copyright \copyright{} 2001, 2002, 2003 Python Software Foundation.
+Copyright \copyright{} 2001-2004 Python Software Foundation.
 All rights reserved.
 
 Copyright \copyright{} 2000 BeOpen.com.

Doc/commontex/license.tex

@@ -73,7 +73,7 @@ license to reproduce, analyze, test, perform and/or display publicly,
 prepare derivative works, distribute, and otherwise use Python
 \version{} alone or in any derivative version, provided, however, that
 PSF's License Agreement and PSF's notice of copyright, i.e.,
-``Copyright \copyright{} 2001-2003 Python Software Foundation; All
+``Copyright \copyright{} 2001-2004 Python Software Foundation; All
 Rights Reserved'' are retained in Python \version{} alone or in any
 derivative version prepared by Licensee.