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/miscellaneous/pdfPlot/pdfPlot.C

@@ -75,7 +75,7 @@ int main(int argc, char *argv[])
         x[i] = xMin + i*(xMax - xMin)/(nIntervals - 1);
     }
 
-    setWriter::New(runTime.graphFormat())->write
+    setWriter::New(runTime.controlDict().lookup("graphFormat"))->write
     (
         pdfPath,
         args.executable(),