* Implemented review suggestions of WTI-Review-564: ** Renamed classes to be more consistent with naming conventions. ** Renamed PersistenceRegistry related variables and text still referring to old code. ** Improved test coverage having multiple characteristic points for a single geometry point of a RingtoetsPipingSurfaceLine. ** Fixed bug where SurfaceLineEntities were incorrectly removed. ** Refactored SurfaceLineEntityReadExtensions on how to read SurfaceLinePointEntity and CharacteristicPointEntity instances. Related to Issue [WTI-289] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@3368 5a3db67b-de53-47b5-99c8-a1c30a6650e2