Proper hashing of some data types (equal objects should return equal hashes!) Reused SequenceEquals instead of implementing this ourselves for collections in data types, e.g. layers in a profile. Implemented TestHelper.AssertCollectionAreEqual to test whether elements in a collection are equal using a IEqualityComparer<T>. Related to Issue [WTI-1342] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@10868 5a3db67b-de53-47b5-99c8-a1c30a6650e2