Changes:
* 0.9.11
* The spring-loaded folder has been implemented for the folder view.
* A function to filter selected messages has been added.
* Always move messages by default when using DnD (copy if Ctrl key is
pressed).
* On filtering, the matching algorithm of 'not contain' flag has
been fixed.
* NNTP servers that require authentication at the beginning of the
session has been supported.
* The method of updating the progress dialog has been modified.
* The context menu on the summary view has been cleaned up.
* The image viewer has been fixed.
* The cache handling has been fixed for AMD64 and other 64-bit platforms.
* The SMTP routine has been fixed to fully comply with RFC 2821
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