Fixed 'Unknown SIP after login/logout'
Report.php, Store.php, QuickFormQuery.php: configuration option 'SESSION_NAME' removed and hard coded to 'qfq'. Session.php, Sip.php: function checkFeUserUid() moved from Sip to Session. Will be called by using 'Session'. SIP's now stored one level deeper in $_SESSION['qfq'][...]. This makes it easier to destroy the SIP cachae in case of login/logout. Destroying the whole $_SESSION var is not a good idea.
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