Reduce the minimum regridding thickness. Necessary for conservation when

there are many thin layers. mom-ocean#62

src/ALE/MOM_regridding.F90

@@ -119,7 +119,7 @@ module MOM_regridding
                  " PQM_IH6IH5 (5th-order accurate)"
 character(len=6), parameter, public :: regriddingDefaultInterpScheme = "P1M_H2"
 logical, parameter, public :: regriddingDefaultBoundaryExtrapolation = .false.
-real, parameter, public :: regriddingDefaultMinThickness = 1.e-3
+real, parameter, public :: regriddingDefaultMinThickness = 1.e-10
 
 ! -----------------------------------------------------------------------------
 ! The following are private constants