Addition of "allow-enlarge" parameter to ImageOp resize operation
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                 Key: COCOON-2133
                 URL: https://issues.apache.org/jira/browse/COCOON-2133
             Project: Cocoon
          Issue Type: Improvement
          Components: Blocks: ImageOp
    Affects Versions: 2.1.11-dev (Current SVN), 2.2-dev (Current SVN)
            Reporter: Robin Wyles
            Priority: Minor
             Fix For: 2.1.11-dev (Current SVN), 2.2-dev (Current SVN)


The addition of an "allow-enlarge" parameter to the resize operation allows the 
user to control whether an image should be enlarged by the operation. 

This new  parameter is declared in the sitemap like so:

<map:read type="imageop" src="image.jpg">
        <map:parameter name="prefix-preserve-ratio" value="true"/>
        <map:parameter name="prefix-allow-enlarge" value="false"/>
        <map:parameter name="prefix-width" value="320"/>
        <map:parameter name="prefix-height" value="240"/>
</map:read>

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