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Fixes #7925. a) change CWD during split reduced to splitting only. b) fixed problem in mkDirParent() with absolute paths, c) make logger independent of CWD, d) fixed problem with `mktemp --tmpdir`(difference Ubuntu 16 / 18) by using PHP function, e) fixed some 'undefined index' problems

Refs #7634. Session Timeout zu kurz. Add logout of FE user. Logout happens not directly on the first call, but on the second or third page access.

Bug #5924: change include_once() against include() - second call to include_once just returned 'true'.

Bug #5890 config.qfq.ini is public readable. Renamed file to config.qfq.php. Implement a basic migration assistant to copy DB credentials to new config.qfq.php. All other values have to be copied to extmanager/qfq-configuration manually.

HelperFormElement.php, SessionCookie.php, Html2Pdf.php, Store.php, Constants.php: migrate to camel case on configuration variables.
Config.php: readConfig() reads now config.qfq.ini and T3 LocalConfiguration.php.

BuildFormPlainTest.php: fixed issue with double declared class FakeTSFE.
ReportTest.php: initially created.

Sip.php: disabled session_start in phpUnit environment.
Store.php, AbstractDatabaseTest.php: removes phpUnit flag in constructor - class is static and the flag will be set in Store::getInstance().
BodyTextParser.php, QuickFormQueryTest.php, StoreTest.php: removed token debugShowStack, TYPO#_DEBUG_LOAD, TYPO3_DEBUG_SAVE - no longer used.
Constants.php: removed token TYPO3_DEBUG_LOAD, TYPO3_DEBUG_SAVE - no longer used.

Store, Constants, Database, QuickformQuery, AbstratDatabase, StoreTest: renamed several config.ini variables to use the '_'.

Database: Moved implementation from PDO to mysqli. Reason: mysqli_num needed for `report`, but PDO can't fetch column names than.