Add a flag to disable multiple fts optimizations in StreamingRenderer
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                 Key: GEOT-2277
                 URL: http://jira.codehaus.org/browse/GEOT-2277
             Project: GeoTools
          Issue Type: Improvement
          Components: core render
            Reporter: Andrea Aime
            Assignee: Andrea Aime
             Fix For: 2.5.3


The streamign renderer builds an in memory drawing canvas for each feature type 
style other than the first in order to avoid scanning the sources contents more 
than once. This hurts non raster outputs thought, in particular PDF and SVG 
generated using teh graphics provided by iText and Batik,
as in that case we want to draw all features as vectors when possible.

Also, in other cases an excessive memory usage has been reported, which can be 
tracked back to the usage of these memory buffers.
So consider adding a flag to scan the feature sources more than once, but draw 
everything on the user provided graphics object.

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