Log Message:
Update Sylpheed to 0.9.10.

Main changes are:
    * A new folder can be created on the folder selection dialog now.
    * The folder view is now updated progressively when receiving.
    * Statasbar has been added to the message view window.
    * The built-in image viewer has been improved, and its memory leaks
      have been fixed.
    * Ukrainian translation has been added.
    * Other bugfixes have been made.