- add back recomputation of rSurfW & S to ensure consistent column thickness   (needed for rStar) between Sum_k(hFac*drF) and rSurf-rLow, for now only   when using pkg/shelfice; was initially added on 2012/06/01 (revision 1.51)   but was removed accidentally on 2014/02/08 (v1.53).
- add back recomputation of rSurfW & S to ensure consistent column thickness
  (needed for rStar) between Sum_k(hFac*drF) and rSurf-rLow, for now only
  when using pkg/shelfice; was initially added on 2012/06/01 (revision 1.51)
  but was removed accidentally on 2014/02/08 (v1.53).

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