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This patch adds code to 'makepng' to allow the generation of smaller images that also give better test case coverage. It also adds copyright and licence to the generated images, reflecting the fact that they are original works of the author of the code. The licence used is the Creative Commons Public Domain one, appropriate to a non-source-code work. The resultant image were used to generate the updated pngstest-errors.h file in a prior commit. Signed-off-by: John Bowler <jbowler@acm.org>