Update of PSS2B to support washout filter bypass and fix of initialisation.
Update of PSS2B to support washout filter bypass and fix of initialisation.

fran-jo/OpenIPSL,OpenIPSL/OpenIPSL,ahsanKTH/ipsl,SmarTS-Lab/OpenIPSL,MaximeBaudette/OpenIPSL,SmarTS-Lab/OpenIPSL,tinrabuzin/OpenIPSL,itesla/ipsl