Warning about incompatible types in AixLib.FastHVAC.Components.Storage.BaseClasses.PartialHeatTransferLayers

Created by: ghorwin

Opening AixLib (development, 2018-03-13) in SimulationX gives the following warning/error:

"Die Modelica-Klassen von AixLib.FastHVAC.Components.Storage.BaseClasses.PartialHeatTransferLayers.Medium (package) und der Basisklasse AixLib.FastHVAC.Media.WaterSimple (record) sind nicht kompatibel. Message: Modelica.IncompatibleBaseClass "

In fact, AixLib.FastHVAC.Media.WaterSimple is a record, yet requested to be a replaceable package.

Simple fix: use same type for replaceable.