Before the assistance was receiving error msg when cancelling a contract.
Also study program leader and assistance got wrong status displayed.
This was due to missing permission check in vertrag.rdf.php and is
fixed now.
Added two hidden fields
. Vertragsstunden
(tbl_vertrag.verstragsstunden)
. VertragsstundenStudiensemester
(tbl_vertrag.vertragsstunden_studiensemester_kurzbz)
to FAS-tab Verträge, which can be displayed by the user.