Added SoilLayer1D as object representing database data and for transforming it to ringtoets piping data. Reverted double value for IsAquifer in PipingSoilLayer to boolean. Related to Issue [WTI-27] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@699 5a3db67b-de53-47b5-99c8-a1c30a6650e2