Log Message:
Changes 4.3.9:
* Fix error if user's account only contains an INBOX

Changes 4.3.8:
* SECURITY: Properly escape user input in Fetchmail configuration.
* Fix updating POP3 indices when using mailbox caching
* Include "anyone" user when listing users in the ACL screen
* Turn DNS prefetching off when displaying untrusted message content

Changes 4.3.7:
* Fix spellcheck-on-send when using fckeditor and no errors exist
* Fix authenticate API call and synchronization when using realms
* Optimize folder tree initialization
* Add command line fetchmail script
* Workaround broken PHP number formatting with some locales