Closer score calculation

I realized it wasn't it after what I said in the
previous commit. Yet still not exact (±1 pt with
actual score). We'll say that's because of floating
point errors :)

reborn.py

@@ -200,7 +200,7 @@ class Drone:
         output(self.id, 'D', client.id, product.id, qt)        
         if client.satisfied():
             global score
-            score += math.ceil((T-(self.avail-1))/T*100)
+            score += math.ceil((T-(self.avail+1))/T*100)
             log("Client", client.id, "satisfied!", "New score:", score)
 
     def wait(self, turns=1):