wrap lines, and add text talking about points before/after range

NOTES.md

@@ -73,20 +73,26 @@ Messages from the websocket:
 	id	description
 	c	Consumption -- current power consumed
 		Sent for each update.  units kW.
-	ng	Net Grid -- What the current power draw is from the grid (negative when sending power).
+	ng	Net Grid -- What the current power draw is from the grid
+		(negative when sending power).
 		Sent for each update.  units kW.
-	p	Solar production -- current power produced by the solar panels in aggregate.
+	p	Solar production -- current power produced by the solar panels
+		in aggregate.
 		Sent for each update.  units kW.
 
 	ov	overview of data, contains gird, production and consumption data.
 		following is JSON object
 
-	win	The graph has set a window size.  The two arguments are start and end.  If this is the
-		first time, NaN will be sent for both, which means to send all data.
+	win	The graph has set a window size.  The two arguments are start
+		and end.  If this is the first time, NaN will be sent for both,
+		which means to send all data.
 
-	windata	Data in response to a window command.  The format is an object w/ the keys, production,
-		grid and consumption.  Each will be a list of data points.  Each point is a pair of
-		timestamp in miliseconds and the value for the point.
+	windata	Data in response to a window command.  The format is an object
+		w/ the keys, production, grid and consumption.  Each will be a
+		list of data points.  Each point is a pair of timestamp in
+		miliseconds and the value for the point.  It should include a
+		point just before and just after the time range so that lines
+		off the graph are rendered properly.
 
 One the first connection, the following messages/data will be sent:
 	c, ng, p, ov