ENH: more stringent checks for fileName concatenation

...ilities/mesh/generation/extrude/extrudeMesh/extrudeMesh.C

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

...ies/parallelProcessing/decomposePar/domainDecomposition.C

...ies/parallelProcessing/decomposePar/faMeshDecomposition.C

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

...arallelProcessing/reconstructParMesh/reconstructParMesh.C

...cessing/miscellaneous/profilingSummary/profilingSummary.C

applications/utilities/preProcessing/mapFields/mapFields.C

src/OpenFOAM/global/argList/argList.C

...erUncollatedFileOperation/masterUncollatedFileOperation.C

src/OpenFOAM/primitives/strings/fileName/fileName.C