Ooof, document this:   - remove obsolete, unused, and partially broken code:     ctrl_obcsvol/ctrl_obcsbal/ctrl_volflux and code within     ALLOW_CTRL_OBCS_BALANCE   - put a stop statement into ecco/cost_obcsvol.F, but also add     cost_obcsvol to ecco_ad_diff.list
Ooof, document this:
  - remove obsolete, unused, and partially broken code:
    ctrl_obcsvol/ctrl_obcsbal/ctrl_volflux and code within
    ALLOW_CTRL_OBCS_BALANCE
  - put a stop statement into ecco/cost_obcsvol.F, but also add
    cost_obcsvol to ecco_ad_diff.list

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