Add background values parameter to Resample operation
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                 Key: GEOT-3076
                 URL: http://jira.codehaus.org/browse/GEOT-3076
             Project: GeoTools
          Issue Type: New Feature
          Components: core coverage
            Reporter: Daniele Romagnoli
            Assignee: Daniele Romagnoli
             Fix For: 2.7-M0


The underlying logic of the coverage processing's Resample operation actually 
looks for a noData category on the input coverage and then setup a constant 
BorderExtender on top of that value to be used by the proper JAI operation 
involved in incoming resampling. (In case there isn't any noData category, it 
will use a "Zero" background value).
It would be helpful to allow specifying an additional parameter such as 
"BackgroundValues" to be used by the resampler.


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