Introduced new SoilLayer2D as an temporary builder class before transforming it to PipingSoilLayers. Introduced SoilProfileBuilder the transformation of 2D Profiles to PipingSoilProfile. Introduced Math2D for containing 2 dimensional calculation routines. Renamed PipingSoilLayerReader to PipingSoilLayer2DReader, because xml parsing only applies for 2D layers. Related to Issue [WTI-27] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@367 5a3db67b-de53-47b5-99c8-a1c30a6650e2