add data.base suggestion for whistle

On 1/24/2014 6:48 AM, a bug reporter wrote:
> The whistle in Nethack has no encyclopedia entry. I suggest for the next
> release something from the M. R. James ghost story 'Oh, Whistle, and I'll Come
> to You My Lad'.
>

dat/data.base

@@ -5321,6 +5321,22 @@ web
 	Oh what a tangled web we weave,
 	When first we practise to deceive!
 		[ Marmion, by Sir Walter Scott ]
+whistle
+	There were legends both on the front and on the back of the 
+	whistle. The one read thus:
+
+	FLA FUR BIS FLE The other: QUIS EST ISTE QUI VENIT 
+	'I ought to be able to make it out,' he thought; 
+	'but I suppose I am a little rusty in my Latin. 
+	When I come to think of it, I don't believe I even 
+	know the word for a whistle. The long one does seem 
+	simple enough. It ought to mean, "Who is this who is coming?" 
+
+	Well, the best way to find out is evidently to whistle 
+	for him.'
+
+		[Ghost Stories of an Antiquary, by Montague Rhodes James
+		 'Oh, Whistle, and I'll Come to You My Lad']
 # werecritter -- see "lycanthrope"
 *wight
 	When he came to himself again, for a moment he could recall