2009-11-14  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* src/sheet.h (gnm_sheet_get_sort_setups): new
	(gnm_sheet_add_sort_setup): new
	(gnm_sheet_find_sort_setup): new
	* src/sheet.c (gnm_sheet_add_sort_setup): new
	(gnm_sheet_get_sort_setups): new
	(gnm_sheet_find_sort_setup): new
	(gnm_sheet_init): initialize new field sort_setups
	(gnm_sheet_finalize): and free them
	* src/sort.c (gnm_sort_data_copy): new
	* src/sort.h (gnm_sort_data_copy): new

2009-11-14  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* dialog-cell-sort.c (set_ok_button_sensitivity): check whether
	  state->sel is NULL
	(cb_dialog_ok_clicked): store a copy of the setup.
	(dialog_cell_sort_load_sort_setup): new stub
	(dialog_load_selection): do more
	(dialog_init): move some code into dialog_load_selection