Fixed Extending to left and extending to right. Other tests seem OK but are in fact not! Cutting is still to be done properly.Related to Issue [MWDAM-2216]
Added test MacroStabilityCommonHelperTests.GivenSoilGeometryProbabilityWithSoilProfile1DAndSurfaceLineWhenCombiningThenSoilProfile2DIsCreated()Made most MacroStabilityCommonHelper methods staticRelated to Issue [MWDAM-2132]