MetatileMapOutputFormat should dispose JAI Chains when possible
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                 Key: GEOS-4799
                 URL: https://jira.codehaus.org/browse/GEOS-4799
             Project: GeoServer
          Issue Type: Improvement
          Components: WMS
    Affects Versions: 2.1.2, 2.1.x, 2.2.x
            Reporter: Simone Giannecchini
            Assignee: Andrea Aime
            Priority: Minor
         Attachments: patch

MetatileMapOutputFormat splits input images into chunks to be cached. In some 
cases we go from RenderedOp to BufferedImage hence we loose grip on the chain 
that generated the MetaTile and we cannot clean the cache at the end of the 
request.

I am attaching some code to improve this situation.

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