Make backend_pgf more flexible when saving to file-handles or streams (fix #1625). #2587
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Since binary data and thus raster images cannot be embedded in pgf code, saving to a stream was prohibited in backend_pgf. This PR allows saving pgf code to streams after deactivating draw_image() and emitting a user warning.
I'll merge this in a few days if there are no objections (fixing issue #1625).