add the -r parameter to r.external (used now to create grass inputs f…

…or processing, replacing r.in.gdal) and so fixes grass modules like r.reclass.area and probably many others

python/plugins/processing/grass/GrassAlgorithm.py

@@ -483,7 +483,7 @@ def exportRasterLayer(self, layer):
         command += ' input="' + layer + '"'
         command += ' band=1'
         command += ' output=' + destFilename
-        command += ' --overwrite -o'
+        command += ' --overwrite -o -r'
         return command
 
     def getTempFilename(self):