Fix copyright notice and description.

debian/control

@@ -8,3 +8,8 @@ Standards-Version: 3.6.0
 Package: magit
 Architecture: all
 Description: A Emacs interface for Git
+ With Magit, you can inspect and modify your Git repositories with
+ Emacs.  You can review and commit the changes you have made to the
+ tracked files, for example, and you can browse the history of past
+ changes.  There is support for cherry picking, reverting, merging,
+ rebasing, and other common Git operations.

debian/copyright

@@ -0,0 +1,18 @@
+    Copyright (C) 2008  Marius Vollmer
+    Copyright (C) 2008  Linh Dang
+
+    Magit 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.
+
+    Magit is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of 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 Magit.  If not, see <http://www.gnu.org/licenses/>.
+
+On Debian systems, the complete text of the GNU General Public License
+can be found in `/usr/share/common-licenses/GPL-3'.

magit.el

@@ -14,9 +14,7 @@
 ;; License for more details.
 ;;
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING.  If not, write to
-;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; along with Magit.  If not, see <http://www.gnu.org/licenses/>.
 
 ;;; Commentary