Download thumbnails for images that are too large

When we decide from the image info that an image is too large,
try a thumb instead.
Pick 640x480 because
  a) we need to pick a size and
  b) That's the right size.
  c) We should make it configurable.

(We could also try this if we didn't have the image info when
we get the error).

Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>

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