Confusion between CONC_MUD_ACTIV_LAYER(IPOIN) and CONC_MUD(1,IPOIN)

In the case of active layer and cohesive sediment. Confusing sometimes CONC_MUD_ACTIV_LAYER and CONC_MUD(1,IPOIN) For clarity, the name of variables CONC_MUD_ACTIV_LAYER and MASS_MUD_ACTIV_LAYER have been changed in CONC_MUD_ACTIV_TEMPO and MASS_MUD_ACTIV_TEMPO

Corrections of bugs and same check of concentration in each subroutine