ENH: Function objects - first pass at updating read functionality

Note: should be using the result of the parent::read(dict) when
deciding whether to read local entries...

src/functionObjects/field/mapFields/mapFields.C

@@ -166,6 +166,8 @@ Foam::functionObjects::mapFields::~mapFields()
 
 bool Foam::functionObjects::mapFields::read(const dictionary& dict)
 {
+    fvMeshFunctionObject::read(dict);
+
     dict.lookup("fields") >> fieldNames_;
     createInterpolation(dict);
     return true;