Time: Removed graphFormat

setFormat no longer defaults to the value of graphFormat optionally set in
controlDict and must be set in the functionObject dictionary.

boundaryFoam, financialFoam and pdfPlot still require a graphFormat entry in
controlDict but this is now read directly rather than by Time.

applications/utilities/postProcessing/noise/noise.C

@@ -155,7 +155,7 @@ int main(int argc, char *argv[])
     // Graph format
     const word graphFormat
     (
-        dict.lookupOrDefault<word>("graphFormat", runTime.graphFormat())
+        dict.lookupOrDefault<word>("graphFormat", "raw")
     );
 
     Info<< "Reading data file" << endl;