05-01-12 Bug

Deleted bug that caused ploblem with the drip irrigation as introduced 04-10-25 together with a salt concentration in the the irrigation water. The water source flow from the container of the dripper is now linked with a SaltSourceFlow to each layer with the water flow rate as given by Wsource. The Totalt input rate of salt by irrigation is summed in the variable TotSaltSourceFlow. The two new variables are enabled only when the Switch Dripper is put to on.  PEJ