py: Allow re-packing BBS structures, and decode Big5 strings internally.


git-svn-id: http://opensvn.csie.org/pttbbs/trunk@6026 63ad8ddf-47c3-0310-b6dd-a9e9d9715204
Add experimental 'postd' implementation.


git-svn-id: http://opensvn.csie.org/pttbbs/trunk@6027 63ad8ddf-47c3-0310-b6dd-a9e9d9715204