document preparations for ridging code and first real ridging code   - move most of "PART 1" of S/R seaice_growth into a new and separate     S/R seaice_reg_ridge that will both regularize the state variable after     advection call the actual ridging routine;   - requires to make 5 fields global fields: d_HEFFbyNEG,d_HSNWbyNEG,     d_AREAbyRLX,d_HEFFbyRLX,saltFluxAdjust;   - remove ridging code from seaice_advdiff   - clean up remaining part 1 of seaice_growth in an attempt to make it     more readable (this is probably subjective)   - call seaice_itd_redist once in the initialisation phase to have the initial     conditions in the correct category   - finally: add new ridging routine for ITD code
document preparations for ridging code and first real ridging code
  - move most of "PART 1" of S/R seaice_growth into a new and separate
    S/R seaice_reg_ridge that will both regularize the state variable after
    advection call the actual ridging routine;
  - requires to make 5 fields global fields: d_HEFFbyNEG,d_HSNWbyNEG,
    d_AREAbyRLX,d_HEFFbyRLX,saltFluxAdjust;
  - remove ridging code from seaice_advdiff
  - clean up remaining part 1 of seaice_growth in an attempt to make it
    more readable (this is probably subjective)
  - call seaice_itd_redist once in the initialisation phase to have the initial
    conditions in the correct category
  - finally: add new ridging routine for ITD code

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