MPC is the Magick Persistent Cache format. The persistent in the format
name is telling. Once its instantiated you can't make it go away-- at
least not until the program exits. Basically we increment the reference
count as soon as its instantiated to ensure it will be cloned if any pixels
are updated. This prevents the on disk pixel cache from being modified.
However, it also leaves the container after the image associated with
the MPC is destroyed. It is most likely possible to patch ImageMagick
to destroy the container but it will require some thought and careful
coding. Most likely it will take a month before we release a patch for
this problem, so stand by...
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