document this: o pkg/obcs: re-organize obcs_calc_stevens.F to prepare for passive tracers
document this:
o pkg/obcs: re-organize obcs_calc_stevens.F to prepare for passive tracers

and last weeks modification that I obiously had forgotten about:
o pkg/seaice: two new runtime parameters:
  - SEAICE_cStar replaces the hard wired "20" in the strength formulation,
    long overdue
  - SEAICE_tensilFac: preparation for Koenig-Beatty+Holland (2012)
    parameterization of tensil stress for fast ice (does not do anything yet)
o pkg/seaice/seaice_check.F: left over from restricted addtive Schwarz method
  for LSR: move checking overlaps out of JFNK-if-block

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