ADD act realtime delete

	修改:         main/application/controllers/act_add.php
	UPDATE the broadcast act add instroductions

	修改:         main/application/controllers/act_list.php
	ADD a function to broadcast the dele message to every one

	删除:         main/application/controllers/act_update.php
	DELE the act_update which can integrated in act_list [C]

	修改:         main/application/models/act_model.php
	ADD a function to update the act_defunct to 1 when the act was delete

	修改:         main/application/views/act_list_view.php
	ADD and UPDATE a series of functions to realtime delete act.AND drop the act from LS and list