maint: update copyrights for 2013 and as per current GNU standards

README-alpha

@@ -62,14 +62,14 @@ some other value.
 
 
 
-Copyright (C) 2001, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
+Copyright 2001, 2003-2005, 2007, 2013 Free Software Foundation, Inc.
 
 This file is part of GNU tar.
 
 GNU tar is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 3, or (at your option)
-any later version.
+the Free Software Foundation; either version 3 of the License, or
+(at your option) any later version.
 
 GNU tar is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -77,6 +77,4 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
-along with tar; see the file COPYING.  If not, write to
-the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-Boston, MA 02110-1301, USA.
+along with this program.  If not, see <http://www.gnu.org/licenses/>.