Name: echo - write a message to a player

Syntax:
	echo(string echo)

Description:
	The echo function writes a string to the player. If you have commands
	in an item that return acknowledging messages like "Ok." or
	"You turn the faucet off", then better use
	this_player()->echo("the message string"); to correspond to the echo
	command.
	Calling echo() means, that your message will eventually not be
	displayed if the person prefers to have less verbose output.
	It's a brief/verbose-type mechanism, a special service to the user.  :)

Return value: 1
	echo always returns 1, so you can end an action-function with
	return ACTOR->echo(<message>); and not get the 'Huh?'.

Examples:
	return ACTOR->echo("You open "+short()+".");

See also: player/query_echo, helpdir/set