* This <emphasis>does not</emphasis> actually sort the model. Use
* pspp_sheet_view_column_set_sort_column_id() if you want automatic sorting
* support. This function is primarily for custom sorting behavior, and should
* be used in conjunction with gtk_tree_sortable_set_sort_column() to do
* This <emphasis>does not</emphasis> actually sort the model. Use
* pspp_sheet_view_column_set_sort_column_id() if you want automatic sorting
* support. This function is primarily for custom sorting behavior, and should
* be used in conjunction with gtk_tree_sortable_set_sort_column() to do