ENH: Adding solar radiation modelling and tutorial changes

.../utilities/preProcessing/viewFactorsGen/searchingEngine.H

...ations/utilities/preProcessing/viewFactorsGen/shootRays.H

...s/utilities/preProcessing/viewFactorsGen/viewFactorsGen.C

src/thermophysicalModels/radiation/Make/files

src/thermophysicalModels/radiation/Make/options

...lds/MarshakRadiation/MarshakRadiationFvPatchScalarField.C

...lds/MarshakRadiation/MarshakRadiationFvPatchScalarField.H

...ture/MarshakRadiationFixedTemperatureFvPatchScalarField.C

...ture/MarshakRadiationFixedTemperatureFvPatchScalarField.H

...ationProperties/boundaryRadiationPropertiesFvPatchField.C

...ationProperties/boundaryRadiationPropertiesFvPatchField.H

...Radiation/greyDiffusiveRadiationMixedFvPatchScalarField.C

...Radiation/greyDiffusiveRadiationMixedFvPatchScalarField.H

...tor/greyDiffusiveViewFactorFixedValueFvPatchScalarField.C

...tor/greyDiffusiveViewFactorFixedValueFvPatchScalarField.H

...FvPatchFields/radiationCoupledBase/radiationCoupledBase.C

...ation/wideBandDiffusiveRadiationMixedFvPatchScalarField.C

...ation/wideBandDiffusiveRadiationMixedFvPatchScalarField.H

...sicalModels/radiation/radiationModels/fvDOM/fvDOM/fvDOM.C

...sicalModels/radiation/radiationModels/fvDOM/fvDOM/fvDOM.H