Fix some copyright notices:
- extend some to 2007
- use njn@valgrind.org instead of njn25@cam.ac.uk
- use "tool" instead of "skin"


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@6703 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/callgrind/main.c b/callgrind/main.c
index 160de95..52cc4b0 100644
--- a/callgrind/main.c
+++ b/callgrind/main.c
@@ -10,8 +10,8 @@
 
    Copyright (C) 2002-2007, Josef Weidendorfer (Josef.Weidendorfer@gmx.de)
 
-   This skin is derived from and contains code from Cachegrind
-   Copyright (C) 2002-2007 Nicholas Nethercote (njn25@cam.ac.uk)
+   This tool is derived from and contains code from Cachegrind
+   Copyright (C) 2002-2007 Nicholas Nethercote (njn@valgrind.org)
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as