general clean-up, and renamed filename extension to avoid conflict with internal reader

...utilities/postProcessing/graphics/PV3FoamReader/Allwclean

...graphics/PV3FoamReader/PV3FoamReader/vtkPV3FoamReader.cxx

...Processing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3Foam.C

...Processing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3Foam.H

...ics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamConvertFaceField.H

...FoamReader/vtkPV3Foam/vtkPV3FoamConvertLagrangianFields.H

...V3FoamReader/vtkPV3Foam/vtkPV3FoamConvertPatchFaceField.H

...3FoamReader/vtkPV3Foam/vtkPV3FoamConvertPatchPointField.H

...s/PV3FoamReader/vtkPV3Foam/vtkPV3FoamConvertPointFields.H

...ics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamConvertVolFields.H

...sing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamUpdate.C

...cs/PV3FoamReader/vtkPV3Foam/vtkPV3FoamUpdateInformation.C

...FoamReader/vtkPV3Foam/vtkPV3FoamUpdateInformationFields.H

bin/paraFoam