Log Message:
Updated to 0.9.8

Changes:

    o The offline mode has been implemented.
    o The performance of the scanning of MH folders has been improved on
      the platforms which support d_type in 'struct dirent'.
    o The error checking on moving/deleting messages has become strict.
    o When getting IMAP4 message list, it now fallbacks to FETCH command
      if server doesn't fully support SEARCH command.
    o Outbox for accounts are now correctly chosen when sending from queue.
    o Gettext has been upgraded to 0.12.1.
    o IPv6 support is now enabled by default.
    o Other bugfixes have been made.