Removes the C,T, P from the output granules when the L2 transforms publish their granules

* Removes the C,T, P from the output granules when the L2 transforms publish their granules. L2 transforms publish granule containing only the physical variable they are for, apart from the lat, lon, time etc passed in. 

* Log debug statements have been added in the L2 transforms so that we can trace where the sea water algorithms may return NAN values for presumably unphysical input values for pressure, temperature etc present in the input granule.