Unit tests failing due to new "alt" weather variable

[dhblum]

Unit tests for the data/data_manager.py and data/data_generator.py in #370 and #367 are failing because of the inclusion of a new column variable being generated by the BoundaryCondition model in the Modelica IBPSA Library that is not expected in the reference results, alt. This was introduced recently to the Modelica IBPSA master in ibpsa/modelica-ibpsa#1520 referencing ibpsa/modelica-ibpsa#1477.

This issue can be fixed by freezing the Modelica IBPSA commit used in the jm docker container used to generate the resource data in the unit tests. This would align with the resource weather data currently included in the test case FMUs.

If we were to update such that the alt variable is an acceptable column variable, we should also update in the test case FMUs, which would require recompilation using updated versions of dependent Modelica Libraries (such as Buildings and IDEAS) to be consistent. Note that they'd have to use specific master commits, since the latest released versions with numbers do not yet include the updated Modelica IBPSA library generating alt.

[dhblum]

Closed by #373.