message: Updated the copyright years, auto-recognition
  Replacing our old 3-clause BSD license with one GitHub automatically
  recognises, hopefully making it easier for people to understand our
  licensing. No substantive change, I thought this was recognised when
  first added.
diff: -Copyright (c) 2011-2018, Kitware, Inc.
  +Copyright (c) 2011-2020, Kitware, Inc.
  All rights reserved.
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
  - * Redistributions of source code must retain the above copyright
  - notice, this list of conditions and the following disclaimer.
  - * Redistributions in binary form must reproduce the above copyright
  - notice, this list of conditions and the following disclaimer in the
  - documentation and/or other materials provided with the distribution.
  - * Neither the name of the Avogadro project nor the
  - names of its contributors may be used to endorse or promote products
  - derived from this software without specific prior written permission.
  +
  +1. Redistributions of source code must retain the above copyright notice, this
  + list of conditions and the following disclaimer.
  +
  +2. Redistributions in binary form must reproduce the above copyright notice,
  + this list of conditions and the following disclaimer in the documentation
  + and/or other materials provided with the distribution.
  +
  +3. Neither the name of the copyright holder nor the names of its 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 LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  -DISCLAIMED. IN NO EVENT SHALL KITWARE, INC. BE LIABLE FOR ANY
  -DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  -(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  -LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  -ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  -(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  -SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  +DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  +FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  +DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  +SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  +CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  +TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  +THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  