Efun:	remove_interactive - disconnects an interactive object

Synopsis:
	int remove_interactive()

Description:
	Each interactive object (eg. players/wizards) has a communication
	socket for sending/receiving commands and output.
	Calling this efun from within such an object closes that socket
	which disconnects the objects. The gamedriver calls the function
	"disconnect" with the object to control what happens in such a case.
	It's usually only used within a player/wizard object and cannot be
	called from another object.

Return value:
	1 if OK (to handle stuff after disconnect)
	0 if something went wrong

See also: efun/exec, helpdir/disconnect