(BaseRenderer.draw_raster_layer): Pass the opacity of the layer to
draw_raster_data rather than the layer.
(BaseRenderer.draw_raster_data): Remove the layer parameter because the
function doesn't need to know about the layer. Add the optional opacity
parameter whose default is 1.0. Add 'PNG' as a supported graphics format.
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trunk/thuban/Thuban/UI/baserenderer.py