Update bacterial yields and consumption of DOC/DON based on a new tracer called the NOSDOC

[pearseb]

Add a new tracer called NOSDOC (nominal oxidation state of dissolved organic carbon) that tracks how reduced to how oxidized dissolved organic matter is. This affects the growth yields of bacteria (Wang & Kuzyakov 2023 Global Change Biology) and therefore affects the rate of consumption of DOC/DON and remineralisation rates of organics to inorganics in the ocean. Growth yields on N are no longer assumed to be as high as 1:1 and now decline as the NOSDOC declines (becomes more reduced). This ensures that bacteria can be N limited and may require supplementing their growth with NH4. This introduces competition with phytoplankton for available NH4 and can further limit bacterial growth and thus remineralisation. But phytoplankton that rely on remineralisation of DOM to inorganic nutrients require bacteria to flourish and so an ecological cross-feeding and mutalism is set up.