Fix problem in upload elements: a) in exception FE_ID was not reported, b) fillStoreVar was not fired.

Logger.php: remove UserAgent - that one is logged in FormSubmitLog Table. Add 'cookie' to filter individual actions.

F4901: implement 'delete split files' if primary file is deleted (record) or exchanged against a new one.

F4901: implement split with 'convert' (jpeg). Refactor chmod(), unlink(), rename(), rmdir(), copy() to use by QFQ version which throws an exception.

B6929 - Treat single file argument like several file argument (savePdf: copy, not move) - refs #6929, closes #6929

Upload: rename 'chmod' to 'chmodFile'. Implement 'chmodDir'. Permissions applied for all new created directories.

B5077 Dynamic Update & FE.type=required: Server fixed - a) dynamic calculated modeSql respected, b) formModeGlobal=requiredOff respected, c) dynamic FE with mode='hidden' are not saved anymore.