Add a copy of the ChartGenerator class. This class will have very reduced functionality and mostly provide the interface defined in OutGenerator and work as a bridge for the Charts that are not in a Diagram (think svg export) This will later replace the ChartGenerator class again after the refactoring is done.

select.abflusstafel = \
    SELECT ABFLUSSTAFEL_NR, \
           ABFLUSSTAFEL_BEZ, \
           GUELTIG_VON, \
           GUELTIG_BIS, \
           PEGELNULLPUNKT, \
           AT.BFG_ID \
    FROM ABFLUSSTAFEL AT \
    WHERE MESSSTELLE_NR LIKE :number