[CF-metadata] new named fields for ocean

[Stephen Griffies]

Jonathan,

I am happy to take your suggestions for the names.  I have taken further 
discussion on the physics of these requested terms off-line.

Best,
  Stephen


> I would prefer keeping the sea_water in sea_water_pressure:
>> sea_water_pressure_at_the_sea_water_surface
>> sea_water_pressure_at_sea_floor

Fine

>> temperature_flux_due_to_rainfall_expressed_as_heat_flux_into_sea_water   
>> temperature_flux_due_to_evaporation_expressed_as_heat_flux_out_of_sea_water 
>> temperature_flux_due_to_runoff_expressed_as_heat_flux_into_sea_water 

Fine