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/solvers/boundaryFoam/makeGraphs.H

@@ -13,7 +13,7 @@ const volSymmTensorField R
 
 runTime.write();
 
-setWriter::New(runTime.graphFormat())->write
+setWriter::New(runTime.controlDict().lookup("graphFormat"))->write
 (
     runTime.globalPath()
    /functionObjects::writeFile::outputPrefix