Extended tests of piping output visualization related classes. Implemented PipingOutputCreator helper which can be used to create a random PipingOutput instance. Related to Issue [WTI-15] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@188 5a3db67b-de53-47b5-99c8-a1c30a6650e2