Increase max_hopcount.

Since requests follow the loop-free tree, this shouldn't increase traffic.

babel.c

@@ -64,7 +64,7 @@ int wired_hello_interval = -1;
 int idle_hello_interval = -1;
 int update_interval = -1;
 
-int max_hopcount = 25;
+int max_hopcount = 65;
 
 struct network nets[MAXNETS];
 int numnets = 0;