MASTER- Blowup wet_dry
There was a blowup issue when using WET_DRY option.
This was related to negative value of h+zeta in zetabc.F.
The update modifies u/v-mask near the boundaries in u/v2dbc.F by computing it at knew time step instead of kstp(to make it more responsive). Another correction has been made in zetabc.F to avoid problem when h+zeta<0