Release 0.6.1 with merge of IBPSA Lib
There was a bugfix regarding FourElement
model in IBPSA Lib, see https://github.com/ibpsa/modelica-ibpsa/pull/1004. To get this into AixLib and have the latest version of IBPSA Lib merged, I will do such a merge and afterwards release version 0.6.1. Since we have some slight changes already in AixLib compared to the latest release, that are ready to see the master, I will work on the development and merge the development into the master.