(issue1596) Sort Export of Middle bedHeight This simplyfies internal Data storage by removing the ArrayList wrapper. Usually this is a list of size 1. The data list of which each member is a distinct sounding is then sorted by description or first indexed KM. Afterwards the km index is mapped in a sorted map to export it in order of km and not in oder of index

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