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tests: print image difference statistics

Pekka Paalanen requested to merge pq/weston:mr/imgstats into master

When a test fails and it produces a difference image, also compute the min/max per-channel signed difference statistics. These numbers can be used to adjust the fuzz needed for fuzzy_match_pixels() to pass. Otherwise one would have to manually inspect the reference and result images and figure out the values.

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