Log Message:
Update to 4.5.6

* Add PostgreSQL support, not tested.

Changelog:
Version 4.5.6 Jan 22th 2013

    Improved language detection
    Improved translations
    Fix link to bugtracker
    Several IE 6/7/8 fixes
    SabreDAV updated to 1.6.6
    Improved error reporting
    Support special characters in mountpoint
    Interpret http 403 and 401 as not authorized in user_webdavauth
    Several fixes for special characters in files and folders
    Improved PostgreSQL support
    Check database names for valid characters
    Fix default email address calculation
    Remove debug output on send password page
    Add SMTP port configuration option
    Only show the max possible upload of 2GB on a 32 bit system
    Show progress during file downloads
    Security: Fix multiple XSS problems: CVE-2013-0201, CVE-2013-0202, CVE-2013-0203
    Security: Fix Code execution in external storage: CVE-2013-0204
    Security: Removed remoteStorage app because of unfixed security problems.