Add full Modelica TestCase annotation also to Base Modelica

[henrikt-ma]

During test implementation, we have quickly arrived at a point where we need to build Base Modelica test models, so even if we are not going to be using the TestCase annotation ourselves, this indicates that the annotation is just as relevant for Base Modelica as it is for full Modelica.

[casella]

Why is it in the package not the model?

Sorry, I missed that. Of course it should be in the model

[henrikt-ma]

Why is it in the package not the model?

Looks like a mistake to not place it side by side with experiment. Fixed.