affected tool chains (shapes_grid, Vectorizing Grid Classes): more 'smoothing' options
shapes_grid/Grid_Classes_To_Shapes: effectively set polygon layer's name
saga_gui, CWKSP_Shapes::_Edit_Snap_Point(): fix, assigning snap position
shapes_grid, Vectorizing Grid Classes: more 'smoothing' options
statistics_grid/grid_pca: removed single grid overwrite option
saga_gui, CWKSP_Shapes::_Edit_Snap_Point(): fix, assigning snap position
saga_gui, CWKSP_Shapes::_Draw_Shape(): don't draw vertices/numbering in thumbnail
saga_api, CSG_Shape_Part::Get_Point(): use modulo if point index < 0 or >= number of points