Achieve successful simulation of 100% MSL 3.2.3 models with NF

[Francesco Casella]

We have a strategic goal of simulating 100% of the MSL models with annotation(experiment(StopTime)), using the new frontend. This involves some remaining issues with the NF, but also some back-end/runtime issues, that were already present with the old FE and are not solved by the new one.

At this point in time, there are 18 models that do not simulate successfully in MSL 3.2.3, and other 27 models that don't pass the verification phase. There are also 55 models that still don't have a reference result file, see #5296.

I have already identified the following open issues:

• New front-end: #5015, #5240, #5284
• Back-end: #5170, #5235
• Testing infrastructure: #5170

I will update the list as I identify the root cause of the remaining failing models.

I think it would be nice if we could fix them before we release 1.14.0. That would be a clearly recognizable milestone for that release.