DECODR1504

DECODR1504 will use the new nutrient datacodes (P#;S#;O#;T#) when interpolating bottle values.
It will preserve the existing datacodes - if the nitrate datacodes are T4, the terpled nitrate datacode will be T4. Please note that, although the T4 datacode means to zero nitrate, the interpolated value will be calculated using observed nitrates so may be non-zero. Its datacode will be inherited from the 1st observed value datacode, so if T4, it would be zero in generated data products.
Nitrate is used for the example but this applies to phosphate silicate nitrite interpolations as well.