Add DeltaWProcessor to process data for a delta W axis. This is basically a copy of the KMIndexProcessor with some added Facets ands with the new doOut interface. The KM Processor will be removed after the bed* diagrams no longer use it.

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