Nyall Dawson c93775f6b1 [processing][gdal] Ensure that GDAL algs output the CORRECT
generated filename for outputs

Previously they were just echoing the input parameter value,
which isn't always a string and accordingly was broken for
temporary outputs. This caused models to break when the output
of a GDAL algorithm was used in a subsequent model step.
2019-02-05 16:55:34 +11:00
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