Added the fine grained backlight hierarchy code.

Depending on how the server sets the backlight it controls the clients
(if OPEN then the clients have individual control). If the client is set to
open (inherited from the server) then each screen has backlight control.

server/screen.c

@@ -12,6 +12,7 @@
 #include "screenlist.h"
 #include "screen.h"
 #include "main.h"
+#include "render.h"
 
 int  default_duration = 0;
 int  default_timeout  = -1;
@@ -38,7 +39,9 @@ screen_create ()
 	s->parent = NULL;
 	s->widgets = NULL;
 	s->timeout = default_timeout; //ignored unless greater than 0. 
-
+	s->backlight_state = BACKLIGHT_NOTSET;	//Lets the screen do it's own
+						//or do what the client says.
+		
 	s->widgets = LL_new ();
 	if (!s->widgets) {
 		fprintf (stderr, "screen_create:  Error allocating widget list\n");