对于10A里增加的new feature Iterator viewer实现循环查看

由于点击左右键查看信息，是通过得到msg_id，然后再调用mmi_sms_read_msg来实现的。所以实现循环查看，即要修改msg_id. 
修改的函数为mmi_um_query_indexing 
可以修改此函数如下，其中有注释//mtk的部分是新加的语句，谢谢~ 

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 ……………………. 

  /* Set data */ 

  memset(result, 0, sizeof(mmi_um_iter_viewer_result_struct)); 

  result->index_number = i + 1; /* display the correct index */ 

  result->total_number = data_list->msg_number; 

  if (i == 0) 

  { 

  result->prev_msg_id = ((srv_um_msg_node_struct *)data_list->list)[(data_list->msg_number) - 1].msg_id;

 //mtk 

  /* First one */ 

  result->next_msg_id = ((srv_um_msg_node_struct *)data_list->list)[i + 1].msg_id; 

 result->prev_msg_type = ((srv_um_msg_node_struct *)data_list->list)[(data_list->msg_number) -1].msg_type;//mtk 

  result->next_msg_type = ((srv_um_msg_node_struct *)data_list->list)[i + 1].msg_type; 

 result->prev_launch_func_ptr = mmi_um_ui_adp_get_viewer_ptr(result->prev_msg_type);//mtk 

 result->next_launch_func_ptr = mmi_um_ui_adp_get_viewer_ptr(result->next_msg_type); 

  } 

  else if (i == (data_list->msg_number - 1)) 

  { 

  /* Last one */ 

  result->prev_msg_id = ((srv_um_msg_node_struct *)data_list->list)[i - 1].msg_id; 

  result->next_msg_id = ((srv_um_msg_node_struct *)data_list->list)[0].msg_id;

 //mtk 

  result->prev_msg_type = ((srv_um_msg_node_struct *)data_list->list)[i - 1].msg_type; 

  result->next_msg_type = ((srv_um_msg_node_struct *)data_list->list)[0].msg_type;//mtk 

 result->prev_launch_func_ptr = mmi_um_ui_adp_get_viewer_ptr(result->prev_msg_type); 

 result->next_launch_func_ptr = mmi_um_ui_adp_get_viewer_ptr(result->next_msg_type);//mtk 

  } 

  else 

  { 

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