t3lib/class.t3lib_userauth.php: Implemented two hooks in the logoff() method....

t3lib/class.t3lib_userauth.php: Implemented two hooks in the logoff() method. One hook for doing operations __before__ logoff() destroys the current session and one hook for doing operations __after__ the session was destroyed.


git-svn-id: https://svn.typo3.org/TYPO3v4/Core/trunk@764 709f56b5-9817-0410-a4d7-c38de5d9e867