Interactive CO2

How I've added interactive CO2.

• ->um
  • ->namelist
    • ->Reconfiguration and Ancillary Control
      • ->Configure ancils and initialise dump fields, add
        • 250: CO2 OCEAN FLUX KG/M**2/S
        • 251: CO2 SURFACE EMISSIONS KG/M**2/S
        • 252: CO2 3D TRACER MASS MIXING RATIO
    • ->UM Science Settings
      • ->General Physics Options
        • ->Carbon Options
          • ->i_co2_opt: 2 (or 1) -> 3
          • ->l_co2_emits: true (not sure about this, u-af435 it is false)

If I turn off the interactive CO2, it looks like I need to ignore stash item 251 (250 and 252 seem to be OK to leave).