2000-01-17  Jody Goldberg <jgoldberg@home.com>

	* src/workbook.c : Menu items for sheet and workbook preferences.

	* src/sheet-view.c (sheet_view_adjust_preferences) : New function.
	* src/sheet.c (sheet_adjust_preferences) : New function.
	(sheet_new) : Init the new preferences.
	(sheet_set_text) : Avoid leaking in the failure case.

	* src/selection.c (sheet_selection_paste) : Pass a context.

	* src/cell.c (cell_render_value) : display_fomulas is now a sheet
	  level preference.
	(cell_is_number) : return boolean.
	(cell_is_zero) : New function.

	* src/item-grid.c (item_grid_draw_cell) : honour display_zero.