Completed implementation of Sellmeijer 4 Forces.Added DamPipingHelper.cs for shared functionality between Bligh and Sellmeijer.Added SoilProfile1DAquiferLayerCombiner.cs.Related to Issue [MWDAM-1054]
Remove Location.Surfaceline2 because in the engine we use no global (RD) surfaceline.Location.LocalXZSurfaceline2 should be used insteadRelated to Issue [MWDAM-1075]