[osg-submissions] Addition of readObject() to the image plugins

[Glenn Waldron]

Robert,

As you may recall, we discussed adding ReaderWriter::readObject() overrides
to all the image plugins in order to facilitate future archive support.
Attached are the necessary modifications. I tested JPEG, but not all the
others... the code is identical though. Note that the DDS plugin already
contained the readObject() implementations.

Thanks! -gw

-- 
Glenn Waldron : Pelican Mapping : http://pelicanmapping.com : 703-652-4791
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