Changes of Sylpheed

* 2.1.2 (development)

    * The core parts were separated into a library (LibSylph), and its license
      was changed to LGPL.
    * The feature to sort the summary by thread date was implemented.
    * When executing IMAP4 operations which take long time, its progress is
      now displayed on the statusbar, and the UI is periodically updated.
    * The number of messages to be copied at a time on IMAP4 was limited to
      prevent timeout error.
    * GPG and SSL settings are now saved even if they are disabled at the
      compile time.
    * The auto detection of Japanese encoding now supports UTF-8 encoding.
    * The text display has been modified a bit.
    * The initial implementation of tray icon was added.
    * Address fields are now normalized before sending.
    * Some problems of the addressbook was fixed.
    * A bug in which message/rfc822 attachments were broken when pgp-signed
      was fixed.
    * Win32: A bug in which opened sockets were not closed properly was fixed.

* 2.1.1 (development)

    * IMAP4 now works with Win32 platform.
    * The sorting of summary now fall backs to comparison by date.
    * localedir, manualdir, and faqdir became user-configurable on configure.
    * A bug that multiple selection of the addressbook with Control key
      didn't work with GTK+ 2.6.9 was fixed.

* 2.1.0 (development)

    * Win32 (MinGW) platform was supported.
    * Many portability fixes were made.