Set EntryPointL and ExitPointL based on DikeToeAtPolder and DikeToeAtRiver of set surfaceline in PipingInput. Modified demo test data as the result with the entry and exit points would result in negative effective stress (error). Related to Issue [WTI-381] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@2216 5a3db67b-de53-47b5-99c8-a1c30a6650e2