ENH: Several additions to thinFilm models

1) Changing the faSolution entry nonOrthoCorr to nFilmCorr entry.
   This entry specify the number of iterations on the film thickness
   Eq which does not correct for laplacian non-orthogonality.

2) Changing laminar turbulent model for the skin friction exerted by
   the flow to the film.

3) Adding optional relaxation factors for source terms coming from
   the added mass of the lagragian particles into the film such as
   rhoSp, pnSp and Usp. Similarly the film pressure (pf) can  be
   relaxed in the inner loops.

4) Adding optional entries to curvatureSepration injection model.
   minimum (fThreshold) force and minimum curvature (minInvR1) for
   separation were added to have more control on determining the
   points of film separation

ENH: ThermoSurfaceFilm in lagragian to search for finiteArea film models