Add copyright, license, and warranty notices

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+Upstream Source
+===============
+
+Copyright (c) 1998-2014 Glenn Randers-Pehrson
+(Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+(Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+
+The PNG Reference Library is supplied "AS IS".  The Contributing Authors
+and Group 42, Inc. disclaim all warranties, expressed or implied,
+including, without limitation, the warranties of merchantability and of
+fitness for any purpose.  The Contributing Authors and Group 42, Inc.
+assume no liability for direct, indirect, incidental, special, exemplary,
+or consequential damages, which may result from the use of the PNG
+Reference Library, even if advised of the possibility of such damage.
+
+Permission is hereby granted to use, copy, modify, and distribute this
+source code, or portions hereof, for any purpose, without fee, subject
+to the following restrictions:
+
+1. The origin of this source code must not be misrepresented.
+
+2. Altered versions must be plainly marked as such and
+must not be misrepresented as being the original source.
+
+3. This Copyright notice may not be removed or altered from
+   any source or altered source distribution.
+
+The Contributing Authors and Group 42, Inc. specifically permit, without
+fee, and encourage the use of this source code as a component to
+supporting the PNG file format in commercial products.  If you use this
+source code in a product, acknowledgment is not required but would be
+appreciated.
+
+
+Distribution Packaging
+======================
+
+Copyright (C) 2014 Patrick "P. J." McDermott
+
+These files may be reproduced, distributed, modified, and otherwise dealt in
+under the terms of the Expat License.
+
+On this system, a copy of the Expat License may be found at
+<file:///usr/share/common-licenses/Expat>.