Refactoring of nut wall function BCs

src/turbulenceModels/incompressible/RAS/Make/files

...ility/wallFunctions/backwardsCompatibilityWallFunctions.C

...ughWallFunction/nutURoughWallFunctionFvPatchScalarField.C

...ughWallFunction/nutURoughWallFunctionFvPatchScalarField.H

...WallFunction/nutUSpaldingWallFunctionFvPatchScalarField.C

...WallFunction/nutUSpaldingWallFunctionFvPatchScalarField.H

...ons/nutUWallFunction/nutUWallFunctionFvPatchScalarField.C

...ons/nutUWallFunction/nutUWallFunctionFvPatchScalarField.H

...ughWallFunction/nutkRoughWallFunctionFvPatchScalarField.C

...ughWallFunction/nutkRoughWallFunctionFvPatchScalarField.H

...ons/nutkWallFunction/nutkWallFunctionFvPatchScalarField.C

...ons/nutkWallFunction/nutkWallFunctionFvPatchScalarField.H