Add a way to specify how layers in
extensions are to be rendered.
(_renderer_extensions): New. List with renderer for layers in
extensions
(add_renderer_extension): New. Add a renderer extension
(init_renderer_extensions): New. Init the renderer extensions
(BaseRenderer.render_map_incrementally): Search
_renderer_extensions for how to draw unknown layer types
(BaseRenderer.draw_raster_data): Add format parameter so that
formats other than BMP can be drawn
(BaseRenderer.draw_raster_layer): Pass an explicit format to
draw_raster_data
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trunk/thuban/Thuban/UI/baserenderer.py