SYNOPSIS
	int remove_call_out(string fun)

DESCRIPTION
	Remove next pending call-out for function fun in this object.
	The time left is returned.
	
	-1 is returned if there were no call-outs pending to this
	function.

EXAMPLE
	To remove every pending call-out to MyTimer() :

	while (remove_call_out("MyTimer") != -1) /* continue */ ;

SEE ALSO
	call_out(E), call_out_info(E), find_call_out(E)