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

This reverts commit 571b5b6a

phpunit: fix problems. Revert change in cb2e2a70: if a record lock exist, another form, with record lock mode=NONE, can't get write access to it. This is what the manual describes.

* Update 'Makefile' to automatically trigger the external Sphinx rednering process.

F5458 Error Log Unique Identifier: Exception message might be an ordinary string or a JSON encoded array.

Manual.rst: Best practice default values.

DragAndDrop.php, QuickFormQuery.php: bug fixes
FillStoreForm.php: no FE on a Form now ok - necessary for dnd sort forms.

DRAGANDDROP.md, PROTOCOL.md: Doc for "drag'n' drop" implementation.
dragAndDrop.php: API endpoint
DragAndDrop.php: Class for implementing drag'n' drop functionality.
Link.php: implement new renderMode=8 - returning only the sip.
QuickFormQuery.php: New entry point for processing "drag'n' drop".