Copyright.txt: Add notice of copyright by contributors

We do not require copyright assignment for contributions to CMake.
Update the top-level notice to mention "Contributors" explicitly.
Add a list of the Contributors whose names already appear in
source-level copyright notices.  Find the list with the command:

    $ git grep -h 'Copyright[^.]' -- *.* \
        Auxiliary Modules Packaging Source Templates Tests \
      | grep -v Kitware | sed 's/^#\? *//' | sort | uniq

Manually refine the list to de-duplicate entries and filter out
notices from third-party code.

1 files changed, 74 insertions, 11 deletions

diff --git a/Copyright.txt b/Copyright.txt
index f99998f..63d7bb8 100644
--- a/Copyright.txt
+++ b/Copyright.txt
@@ -1,6 +1,5 @@
 CMake - Cross Platform Makefile Generator
-Copyright 2000-2016 Kitware, Inc.
-Copyright 2000-2011 Insight Software Consortium
+Copyright 2000-2016 Kitware, Inc. and Contributors
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -14,10 +13,9 @@ are met:
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
 
-* Neither the names of Kitware, Inc., the Insight Software Consortium,
-  nor the names of their contributors may be used to endorse or promote
-  products derived from this software without specific prior written
-  permission.
+* Neither the name of Kitware, Inc. nor the names of Contributors
+  may be used to endorse or promote products derived from this
+  software without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@@ -33,12 +31,77 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 ------------------------------------------------------------------------------
 
+The following individuals and institutions are among the Contributors:
+
+* Aaron C. Meadows <cmake@shadowguarddev.com>
+* Aleksey Avdeev <solo@altlinux.ru>
+* Alexander Neundorf <neundorf@kde.org>
+* Alexander Smorkalov <alexander.smorkalov@itseez.com>
+* Alex Turbov <i.zaufi@gmail.com>
+* Andreas Pakulat <apaku@gmx.de>
+* Andreas Schneider <asn@cryptomilk.org>
+* André Rigland Brodtkorb <Andre.Brodtkorb@ifi.uio.no>
+* Axel Huebl, Helmholtz-Zentrum Dresden - Rossendorf
+* Benjamin Eikel
+* Bjoern Ricks <bjoern.ricks@gmail.com>
+* Brad Hards <bradh@kde.org>
+* Christopher Harvey
+* Christoph Grüninger <foss@grueninger.de>
+* Clement Creusot <creusot@cs.york.ac.uk>
+* Daniel Blezek <blezek@gmail.com>
+* Daniel Pfeifer <daniel@pfeifer-mail.de>
+* Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+* Eran Ifrah <eran.ifrah@gmail.com>
+* Esben Mose Hansen, Ange Optimization ApS
+* Geoffrey Viola <geoffrey.viola@asirobots.com>
+* Gregor Jasny
+* Helio Chissini de Castro <helio@kde.org>
+* Ilya Lavrenov <ilya.lavrenov@itseez.com>
+* Insight Software Consortium <insightsoftwareconsortium.org>
+* Jan Woetzel
+* Kelly Thompson <kgt@lanl.gov>
+* Konstantin Podsvirov <konstantin@podsvirov.pro>
+* Mario Bensi <mbensi@ipsquad.net>
+* Mathieu Malaterre <mathieu.malaterre@gmail.com>
+* Matthaeus G. Chajdas
+* Matthias Kretz <kretz@kde.org>
+* Matthias Maennich <matthias@maennich.net>
+* Miguel A. Figueroa-Villanueva
+* Mike Jackson
+* Mike McQuaid <mike@mikemcquaid.com>
+* Nicolas Bock <nicolasbock@gmail.com>
+* Nicolas Despres <nicolas.despres@gmail.com>
+* Nikita Krupen'ko <krnekit@gmail.com>
+* OpenGamma Ltd. <opengamma.com>
+* Per Øyvind Karlsen <peroyvind@mandriva.org>
+* Peter Collingbourne <peter@pcc.me.uk>
+* Petr Gotthard <gotthard@honeywell.com>
+* Philip Lowman <philip@yhbt.com>
+* Philippe Proulx <pproulx@efficios.com>
+* Raffi Enficiaud, Max Planck Society
+* Raumfeld <raumfeld.com>
+* Roger Leigh <rleigh@codelibre.net>
+* Rolf Eike Beer <eike@sf-mail.de>
+* Roman Donchenko <roman.donchenko@itseez.com>
+* Roman Kharitonov <roman.kharitonov@itseez.com>
+* Ruslan Baratov
+* Sebastian Holtermann <sebholt@xwmw.org>
+* Stephen Kelly <steveire@gmail.com>
+* Sylvain Joubert <joubert.sy@gmail.com>
+* Thomas Sondergaard <ts@medical-insight.com>
+* Tobias Hunger <tobias.hunger@qt.io>
+* Todd Gamblin <tgamblin@llnl.gov>
+* Tristan Carel
+* University of Dundee
+* Vadim Zhukov
+* Will Dicharry <wdicharry@stellarscience.com>
+
+See version control history for details of individual contributions.
+
 The above copyright and license notice applies to distributions of
-CMake in source and binary form.  Some source files contain additional
-notices of original copyright by their contributors; see each source
-for details.  Third-party software packages supplied with CMake under
-compatible licenses provide their own copyright notices documented in
-corresponding subdirectories.
+CMake in source and binary form.  Third-party software packages supplied
+with CMake under compatible licenses provide their own copyright notices
+documented in corresponding subdirectories or source files.
 
 ------------------------------------------------------------------------------