AbstractGridCoverage2DReader could set the source region
--------------------------------------------------------

                 Key: GEOT-1650
                 URL: http://jira.codehaus.org/browse/GEOT-1650
             Project: GeoTools
          Issue Type: Improvement
          Components: core coverage
    Affects Versions: 2.5-M0, 2.4-RC0
            Reporter: Andrea Aime
            Assignee: Simone Giannecchini
             Fix For: 2.4.0, 2.5-M1


setReadParams has enough information to set the source region in the 
ImageReadParam. Depending on the format this might save reading significant 
portions of the original file, and reduce the memory usage in the tile cache as 
well. Simone, what do you think?

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