Optimize repeated crops and respect the tile cache hints
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                 Key: GEOT-3673
                 URL: https://jira.codehaus.org/browse/GEOT-3673
             Project: GeoTools
          Issue Type: Improvement
          Components: coverage
    Affects Versions: 2.7.2
            Reporter: Andrea Aime
            Assignee: Simone Giannecchini


The code occasionally performs repeated crops, moreover the crop operation used 
does not honor the tile cache hints, always ends up using the default tile 
cache.
The latter is a bug in JAI that can be solved by rewriting the crop operation, 
which has no native acceleration and is very simple code wise, so that it 
actually uses the tile cache specified in the hints

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