There is no longer any need for the surfaceFilmModel abstract base class and
"New" selection method as surface films are now handled within the fvModel
framework. This makes the surfaceFilmModel entry in the surfaceFilmProperties
dictionary redundant.
The surfaceFilm and VoFSurfaceFilm fvModels now instantiate a thermoSingleLayer
providing direct access to all the film functions, simplifying the
implementation better ensuring consistency between the film and primary region
equations.
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