Add test job for BaseModelica export/import #103

@adrpo I need to run an on-demand test job on the library testsuite which does the following steps for each model with annotation StopTime:

• flatten the model with --BaseModelica, writing the output in the files directory as Path.To.Model.ModelName.mo
• read that output back into OMC, simulate it, and run the verification step if reference files are available
• link the flattening and compilation logs (combined) with the model name in the report (as usual, just add the flattening log)
• link the simulation log to the (sim) link (as usual)
• provide link to the verification errors if necessary (as usual)
• link the BaseModelica output to an additional (BaseModelica) text

@adrpo, we'll have the next meeting of the BaseModelica working group on May 16, it would be nice to have some results by the and of April, so we can do some debugging on the NF if necessary and get there with some interesting results.

@perost, we need to discuss --BaseModelica import, I'll open a separate ticket about that.