better error message in replication when packet is too large

sql/mini_client.cc:
  pass along ER_NET_PACKET_TOO_LARGE
sql/slave.cc:
  better error message when the packet is too large in slave thread

sql/mini_client.cc

@@ -330,9 +330,15 @@ mc_net_safe_read(MYSQL *mysql)
     if(errno != EINTR)
       {
         mc_end_server(mysql);
+	if(net->last_errno != ER_NET_PACKET_TOO_LARGE)
+	  {
             net->last_errno=CR_SERVER_LOST;
             strmov(net->last_error,ER(net->last_errno));
 	  }
+	else
+	  strmov(net->last_error, "Packet too large - increase \
+max_allowed_packet on this server");
+      }	
     return(packet_error);
   }
   if (net->read_pos[0] == 255)

sql/slave.cc

@@ -1294,8 +1294,18 @@ try again, log '%s' at postion %s", RPL_LOG_NAME,
 	      goto err;
 	    }
 
+	  	  
 	  if (event_len == packet_error)
 	  {
+	    if(mc_mysql_errno(mysql) == ER_NET_PACKET_TOO_LARGE)
+	      {
+		sql_print_error("Log entry on master is longer than \
+max_allowed_packet on slave. Slave thread will be aborted. If the entry is \
+really supposed to be that long, restart the server with a higher value of \
+max_allowed_packet. The current value is %ld", max_allowed_packet);
+		goto err;
+	      }
+	    
 	    thd->proc_info = "Waiting to reconnect after a failed read";
 	    if(mysql->net.vio)
  	      vio_close(mysql->net.vio);