Merge remote-tracking branch 'origin/b9735-fileDeleteNoTriggerDirty' into B9720CheckboxVariousSetups

# Conflicts:
#	extension/Classes/Core/AbstractBuildForm.php

mark changed couldn't be triggered without inititiator

B9734 dirty lock release

See merge request !220

Fixes #9733: add JS code to name browser tabs individually. New GET variable 'tabUniqId' on record acquire is now saved in dirty record. On page reload, when the 'release' comes after 'acquire' (async behaviour), the locking is skipped (if same user session) - on reload there is no variable 'tabUniqId'. On real lock acquire, the tab ID is compared and will be denied if not matching. The 'tabUniqId' might not work in IE - doesn't matter: it's a seldom special situation.

Drag'n'Drop broken: after refactoring Support.php, the drag'n'drop was broken - '$store' wasn't initialized.

# Conflicts:
#	javascript/src/QfqForm.js

Refs #9691: Radio Plain um HTML Attribute 'required' auf input element erweitert. Element erzeugt aber trotzdem kein 'invalid form' wenn nichts angegeben ist.

This reverts merge request !217

This reverts commit dff42417

Das war doch nicht das Problem.

This reverts commit fd1c863a

QFQ meldet immer 'required missing'