2003-05-20  Jody Goldberg <jody@gnome.org>

	* src/sheet-object-graph.c (sheet_object_graph_remove_from_sheet) : new.
	(sheet_object_graph_class_init) : hook it up.

	* src/graph.c (gnm_go_data_vector_finalize) : free the values too.
	(gnm_go_data_scalar_set_sheet) : handle unlinking too.
	(gnm_go_data_vector_load_len) : only free the buffer if the length
	  changed.
	(gnm_go_data_vector_set_sheet) : ditto.
	(cb_assign_val) : be smarter and collect min/max and do decent end
	  checking.
	(nm_go_data_vector_load_values) : use the additional information.