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/debug.c b/callgrind/debug.c
index f9bc378..ff700ee 100644
--- a/callgrind/debug.c
+++ b/callgrind/debug.c
@@ -1,11 +1,11 @@
 /*
-   This file is part of Callgrind, a Valgrind skin for call graph
+   This file is part of Callgrind, a Valgrind tool for call graph
    profiling programs.
 
    Copyright (C) 2002-2007, Josef Weidendorfer (Josef.Weidendorfer@gmx.de)
 
-   This skin is derived from and contains lot of code from Cachegrind
-   Copyright (C) 2002 Nicholas Nethercote (njn25@cam.ac.uk)
+   This tool is derived from and contains lot of code from Cachegrind
+   Copyright (C) 2002 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