Fixes #7620. Label align left/center/right. Defined by config/form/formelement. FormEditor slightly redesigned.

Fixes #7594: FE.type=extra: don't name it 'type' or 'id' or 'L' - more detailed error message and an explanation in Manual.rst.

Bug 7514. AS ..pdf|..file|..link broken defaults. Refs #7514. Fixes pdf, file. 'link' seems still be broken.

Refactor: Manual.rst update config variables (reorder), add 'qfqLog'. Support.php: formSubmitLog hardcoded to fileadmin/protected/log. DOCUMENTATION_QFQ > SYSTEM_DOCUMENTATION_QFQ. Remove config var 'logDir'.

Manual.rst: update documentation after refactor 'extension/qfq/qfq/...' to 'extension/Source/core/...'. Fixed outdated mail.log statement.

Manual.rst: several places where the bs-column description are updated with the new way 'col-md-...' instead of '12'

Manual.rst: Replace ''{{pageId' with '{{pageAlias'. Replace '... AS _Page' by '... AS _page'. Add 'tablesorter tablesorter-filter' to FormEditor example page.

Fixes #3992 (Feature): dbNameQfq & dbNameData already implemented. dbNameT3 renamed from T3_DB_NAME. No more configuration in config.qfq.php necessary. Manual updated.
AbstractException.php: fixes access to uninitialized array elements.
Download.php: get dbT3 now from STORE_SYSTEM
Config.php: read 'dbNameT3' from TYPO3_CONF_VARS or from T3 config file.
QuickFormQuery.php: refactor gathering 'dbNames' - now from config.qfq.php. Fixes bug in getForwardMode() for QFQ inline editing.

Fixes #7407: MariaDB / Ubuntu 18 complains about missing values if column of type TEXT isn't explicit specified in INSERT. New default for database.init=SET sql_mode = "NO_ENGINE_SUBSTITUTION"

Manual.rst: Change _Paged to _paged in FormEditor example. Remove description to never implemented <level>.db. Add report keyword description <dbIndex>.

F4906 Php Session Timeout: can be specified globally in configuration and per form. Affects only logged in FE User.