Update to 6.0.1

Changelog:
Version 6.0.1 Jan 22th 2014

    Fix handling of encryption keys
    Disable xcache in case admin auth is disabled
    Speed DB improvements in user home directory location fetching
    Fix some APC configuration problems
    Fix duplicate .exe mime-type detection
    Support DECIMAL DB schema statement
    Fix some API response code problems
    Added download workaround for some Android versions.
    Turn off not working mod_pagespeed extension
    Command line tool option to show user number
    Some LDAP fixes for certain configurations
    Fix previews for reshared files
    Fix unshare on delete behaviour
    Fix a CIFS mounting timezone problem
    File Trash handling fixes
    Fix potential data corruption problem during massive parallel uploads of the same file
    Fix versions expiration logic
    Fix public upload progress bar
    Fix issues with intermittent ���Insufficient Storage��� message when quota is enabled

(ryoon)