Powerpoint writer: Improve image handling.

We now determine image and caption placement by getting the dimensions
of the content box in a given layout. This allows for images to be
correctly sized and positioned in a different template.

Note that iamges without captions and headers are no longer
full-screened. We can't do this dependably in different layouts,
because we don't know where the header is (it could be to the side of
the content, for example).

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