ENH: construct string types from Istream now explicit (#1033)

...nModels/liquidProperties/liquidPropertiesSurfaceTension.C

...nModels/liquidProperties/liquidPropertiesSurfaceTension.H

...InterFoam/multiphaseMixtureThermo/phaseModel/phaseModel.H

...Model/MultiComponentPhaseModel/MultiComponentPhaseModel.C

...InterFoam/phasesSystem/phaseModel/phaseModel/phaseModel.C

...ies/postProcessing/dataConversion/smapToFoam/smapToFoam.C

src/OpenFOAM/db/dictionary/dictionary.H

.../derived/fixedNormalSlip/fixedNormalSlipPointPatchField.C

src/OpenFOAM/matrices/LduMatrix/Solvers/PBiCCCG/PBiCCCG.C

src/OpenFOAM/matrices/LduMatrix/Solvers/PBiCICG/PBiCICG.C

src/OpenFOAM/matrices/LduMatrix/Solvers/PCICG/PCICG.C

.../GAMGAgglomerations/GAMGAgglomeration/GAMGAgglomeration.C

src/OpenFOAM/primitives/Pair/Pair.H

src/OpenFOAM/primitives/Tuple2/Tuple2.H

src/OpenFOAM/primitives/bools/Switch/Switch.H

src/OpenFOAM/primitives/strings/fileName/fileName.H

src/OpenFOAM/primitives/strings/keyType/keyType.H

src/OpenFOAM/primitives/strings/parsing/parsing.H

src/OpenFOAM/primitives/strings/string/string.H

src/OpenFOAM/primitives/strings/word/word.H