set TOP var values in Ice-shelve melted cell

Context

Please provide informations on how to set the modelling environment

• Reference configuration/test case (to add, chosen or used as template)
• Modifications of versioned files: Fortran routines (*.[Ffh]90), namelists (namelist\_*cfg), outputs settings (*.xml), ...
• Additional dependencies
• New datasets
• Any other relevant information

Proposal

NEMO with interactive ice-shelves only set new values to T and S, preventing to run NEMO-IS with the biogeochemistry. Here we add a module that copy what is done for T and S, and apply it to the passive tracers. This would enable NEMO-IS and the BGC model to run happily altogether.