Added verification of the database schema of DSoil-Model in which stochastic soil model names need to be unique. Introduced StochasticSoilModelCollection which has additional validation for the uniqueness of the StochasticSoilModel Name. Renamed files containing Table constants. Related to Issue [WTI-1093] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@8216 5a3db67b-de53-47b5-99c8-a1c30a6650e2