zuteilung table uses kontakcolumn
BUG FIX: Handling of Zuteilung was incorrect when a specific Aufgabe was directly selected. Delted all other Zuteilungen on account of incorrect status tags passed to the field

This looks like a backdoor for an attack :-( ? Need to rethink entire logic here, I am afaird...
small code cleanup

afugabe has a method to compute its meldungen

ürobably extend that to zuteilungen as well !