Convert debian/copyright file to the DEP5 format.

The DEP5 format is machine-parseable, which will help keep track of
things in the future.

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>

debian/copyright

@@ -1,9 +1,23 @@
-This will be filled in later.
+Format-Specification: http://svn.debian.org/wsvn/dep/web/deps/dep5.mdwn?op=file&rev=135
+Name: Koha
+Maintainer: Lars Wirzenius <lars@catalyst.net.nz>
+Source: git://git.koha-community.org/koha.git
 
-Copyright by various people.
-
-Debian packaging copyright:
-
-Copyright 2010 Catalyst IT Ltd
+Files: *
+Copyright: 2000-2010, various people and organisations
+License: GPL-2+
+ Koha 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 2 of the License, or (at your option) any later
+ version.
 
+ Koha 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
+ Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
+ Suite 330, Boston, MA  02111-1307 USA
+ .
+ On a Debian system, you can find a copy of GPL version 2 at
+ /usr/share/common-licenses/GPL-2 .