OverviewsEmbedder: Set SUBFILETYPE TIFF TAG when creating inner tiff overviews
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                 Key: GEOT-2806
                 URL: http://jira.codehaus.org/browse/GEOT-2806
             Project: GeoTools
          Issue Type: Improvement
          Components: gc coveragetools
    Affects Versions: 2.6.0, 2.5.8
            Reporter: Daniele Romagnoli
            Priority: Minor
         Attachments: overviewsembedder.diff

Actually, the overviews embedder appends the overviews to the same image output 
stream.
In case we are writing to TIFF files, we should add a newsubfiletype TAG with 
the value ReducedImage to specify that the actual image is a reduced resolution 
version of the image.

See:
http://www.awaresystems.be/imaging/tiff/tifftags/newsubfiletype.html



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