Remove .internalField() clutter for const-access to the internal field

.../dataConversion/foamDataToFluent/writeFluentScalarField.C

.../dataConversion/foamDataToFluent/writeFluentVectorField.C

src/finiteVolume/cfdTools/general/MRF/MRFZone.C

src/finiteVolume/cfdTools/general/MRF/MRFZoneTemplates.C

...lume/ddtSchemes/localEulerDdtScheme/localEulerDdtScheme.C

...e/snGradSchemes/faceCorrectedSnGrad/faceCorrectedSnGrad.C

...me/finiteVolume/snGradSchemes/snGradScheme/snGradScheme.C

...on/surfaceInterpolation/schemes/pointLinear/pointLinear.C

...n/surfaceInterpolationScheme/surfaceInterpolationScheme.C

...ons/sources/derived/meanVelocityForce/meanVelocityForce.C

...aceFilmModels/kinematicSingleLayer/kinematicSingleLayer.C

.../filmRadiationModel/constantRadiation/constantRadiation.C

...mo/filmRadiationModel/primaryRadiation/primaryRadiation.C

.../filmRadiationModel/standardRadiation/standardRadiation.C

...s/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.C

src/sampling/meshToMesh0/calculateMeshToMesh0Weights.C

src/thermophysicalModels/basic/heThermo/heThermo.C

src/thermophysicalModels/basic/psiThermo/hePsiThermo.C

src/thermophysicalModels/basic/rhoThermo/heRhoThermo.C

...Models/reactionThermo/psiuReactionThermo/heheuPsiThermo.C