Refs #7743. Move error mesages to Constants.php. Unit tests use those constants now. 'data-pattern-error' only delivered if a 'pattern' is given. 'required' attribute only delivered is set.

FormElement.type=select: fixed problem with dynamic update and mode=readonly - list was still selectable.

Redesing FormEditor: FormElement as second pill. Hide MultiForm as long as it not active. Rename Various to Layout.

Fixes #7603: Unit test if DatabaseUpdate() plays well. Especially that formEditor.sql is running fine.

File not found in FE.type=file: Show more clearly that the pathfilename is only shown when ShowDebugInfo=on.

File not found in FE.type=file: Show more clearly that the pathfilename is only shown when ShowDebugInfo=on.

B3464: FE.type=subrecord, mode=readonly - fixed that sub form should be open with 'formGlobalMode=readonly'

Fixed broken init in phpunit run. Fixed access to uninitialized var. Throw exception if dndTable or form is missing.

Fixes #7001 - Error message: if 'modeSql' fails, error message does not contain a reference to the causing FE.

Bug: drag and drop failed due to fillStoreForm requests {{form:S}} which was not necessary for drag and drop.

Parameter 'form' in der SIP hinzugefuegt - 1) keine Ahnung warum das frueher funktioniert hat, 2) FE_DND_TABLE sollte dann nicht mehr noetig sein - Code muss aufgeraeumt werden.