Log Message:
Update to 2.2.10:

* 2.2.10 (stable)

    * The change between folders became faster at GTK+ 2.10.x.
    * The text insertion by the action was fixed again.
    * The text redraw problem on the undo of large text was fixed.
    * The crash that occurred when printing a message with empty Subject,
      From and To was fixed.
    * The window position and the layout of the 'Add Address' dialog was
      modified.
    * Libpisock 0.12 was supported.
    * Win32: The bug that window position was reset when quitting Sylpheed
      while window was hidden was fixed.
    * Win32: The selection of the labels on the header view and the alert
      dialog are now visible.
    * Win32: The e-mail menu in the start menu now works when Sylpheed is
      selected as a default mailer.
    * Win32: The character corruption on printing when environment-dependent
      Japanese characters are used was fixed.