[Magick-bugs] convert A.gif B.gif loses extension blocks

[Richard]

If I just read a GIF file with ImageMagick and then write it back out,
the application extension blocks are lost.

Original image:
<http://www.xmission.com/~legalize/fractals/fractdev/fract001.gif>

Converted image:
<http://www.xmission.com/~legalize/fractals/fractdev/fract001-converted.gif>
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