Add general support for external overviews (.ovr) on raster plugins
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                 Key: GEOT-3662
                 URL: http://jira.codehaus.org/browse/GEOT-3662
             Project: GeoTools
          Issue Type: Improvement
          Components: coverage
    Affects Versions: 8.0-M0
            Reporter: Daniele Romagnoli
            Assignee: Daniele Romagnoli
            Priority: Minor


With GEOT-3643, support for external overviews (.ovr) has been added on GeoTiff 
reader.
It would be great to have such a support for other raster plugins too (where 
this is possible).
As an instance, JPEG doesn't allow to create overviews within the file. A user 
could like to add them as external .ovr through GDAL. We could then support 
through a World Image Reader such a JPEG with external overviews.


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