Implemented reader for closing structures calculation configurations. For height structures calculations configuration reader tests, added values for stochasts variation coefficient/standard deviation where not present, because not importing this is not the responsibility of the reader. This makes the tests more representative for the purpose of the reader. Related to Issue [WTI-1169] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@9108 5a3db67b-de53-47b5-99c8-a1c30a6650e2