Allow deeper box nesting -- up to 28 levels. Hard limit would be

31 (or maybe 32).

src/specks.h

@@ -350,7 +350,7 @@ struct stuff {
   float boxlabelscale;
   float boxlinewidth;
   float goboxscale;
-#define MAXBOXLEV 16
+#define MAXBOXLEV 28
   float boxscale[MAXBOXLEV];
   struct AMRbox **boxes;	/* An array per time step */