New logic requires not to complain about missing lock during release.

Neu jeder abgelaufene Lock geloescht. Damit ist ein 'Extend' nicht mehr wirklich machbar.

AbstractBuildForm.php: code cleanup

AbstractBuildForm.php: code cleanup

AbstractBuildForm.php: placeholder

Check if Record is already exclusive locked. If yes, show Form in readonly mode.

Manual.rst: how to use the multi language forms.
DatabaseUpdateData.php: Update DB with new language fields.
HelperFormElement.php: modify explodeParameter() to not check already existing definitions.
QuickFormQuery.php: new setLanguage().

Manual.rst: Update Manual on how to use escape.
KeyValueStringParser.php: Detect if the exepensive preg_split is necessary. Implement explodeEscape().

Buf #4257 / Dynamic update broken - after changing JSON data structure, update load.php has been missed.

AutoCron.php: STORE_PARENT will be filled with - Webpage: either the current cron job, Mail: the current Mailrecord (sql1). Use them with {{....:PE:all}}

formEditor.sql: udpate some comments to form 'cron'.

Check if Record is already exclusive locked. If yes, show Form in readonly mode.

Small fix in manual.rst.