TestFreeOffset not working

[ceraolo]

I tried Controls.Test.TestFreeOffset with Dymola 2020x (I chose this a bit old because it is distributed with MSL 3.2.3) and OM (1.21.0-dev-148 and 1.22.0-dev-39).
Screenshot from Dymola:

Screehsot from OM

[casella]

@ceraolo I tested it with OMC, and it also complains about initialization issues:

The initialization problem is inconsistent due to the following equation: 0 != 1 = 1.0 - freeOffset1.y

I'm not sure why we didn't add an experiment annotation, so these models did not end in the OMC CI testing report, but that was obviously a bad mistake 😅

@AndreaBartolini we should review all those tests and add the experiment annotation to them so they get tested by the CI.