2002-08-04  Zbigniew Chyla  <cyba@gnome.pl>

	* src/func.[ch]
	(struct _FunctionDefinition): Added ref_notify
	(fn_def_new): Get extra (optional) argument and copy it to ref_notify
	(function_add_args, function_add_nodes, function_add_name_only):
	Get extra arg and pass it to fn_def_new.
	(func_ref): Call ->ref_notify on every change of refcount from 0 to 1
	(func_unref): ... and from 1 to 0

	* src/plugin-service.c:
	(plugin_service_function_group_func_ref_notify): New,
	call gnm_plugin_use_(un)ref when provided function is (de)referenced.
	(plugin_service_function_group_activate): Removed FIXME, pass
	extra argument to function_add_name_only.

	* func-builtin.c
	(func_builtin_init): Adjusted to function_add_* signature changes.