RT-Thread/rt-thread — pull request #237 by prife (2014-02-09 07:36:14+00:00)
Title: dfs: support copy directory

add more features for copy
1. copy file
copy file dir_exsit
copy file file_non_exsit

2. copy directory (implement with recursive call)
copy dir dir_exsit
copy dir dir_non_exsit