Extended set_attr method so zeta in SWI2 can be set (list of util_3d objects).
Extended set_attr method so zeta in SWI2 can be set (list of util_3d objects).

mrustl/flopy,aleaf/flopy,jentjr/flopy,bdestombe/flopy-1,brclark-usgs/flopy,brclark-usgs/flopy,aleaf/flopy,jentjr/flopy