OSspecific: isDir(), isFile() instead of dir(), file()

.../utilities/parallelProcessing/decomposePar/decomposePar.C

...lities/parallelProcessing/reconstructPar/reconstructPar.C

...allelProcessing/redistributeMeshPar/redistributeMeshPar.C

...stProcessing/dataConversion/foamToEnsight/foamToEnsight.C

...ng/dataConversion/foamToEnsightParts/foamToEnsightParts.C

...essing/dataConversion/foamToFieldview9/foamToFieldview9.C

...ities/postProcessing/dataConversion/foamToVTK/foamToVTK.C

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

...es/postProcessing/graphics/PVFoamReader/vtkFoam/vtkFoam.C

...ocessing/graphics/ensightFoamReader/USERD_set_filenames.H

...stProcessing/graphics/fieldview9Reader/fieldview9Reader.C

...ations/utilities/postProcessing/velocityField/Mach/Mach.C

src/OSspecific/Unix/Unix.C

src/OpenFOAM/db/IOobject/IOobject.C

src/OpenFOAM/db/IOobjectList/IOobjectList.C

src/OpenFOAM/db/IOstreams/Fstreams/IFstream.C

src/OpenFOAM/db/IOstreams/Fstreams/OFstream.C

src/OpenFOAM/db/Time/findInstance.C

src/OpenFOAM/global/JobInfo/JobInfo.C

src/OpenFOAM/global/argList/argList.C