see http://www.goto.info.waseda.ac.jp/~tatsuya/rpatricia/

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 0.05 2010/03/??
 - reorganized directory layout

0.04 2008/2/19
 - fixed the bug of "clear" method (destroy)
   node data were not cleared correctly

 - fixed the memory leak in search methods
   I had to clear the prefix instances

0.03 2008/2/17
 - fixed the bug of allocating user_data strings

0.02 2008/1/31
 - fixed the bug of printing prefix for 64-bit architecture 
   from Aki Nakao

0.01 2007/11/16
 - the first version