Automatic loading of required libraries

It would be nice to have menu entries like "Open Logical Model" or "Open Systems Biology Model".
The commands should load the corresponding library file and open a file chooser to search for the mdl file for the model.

The path to the corresponding library file could be configured via a MenuItem under "Options" in the ProMoT Class Browser.

There should be a confirmation dialog if there are already libraries loaded because classes could be redefined.

Extension to different libraries: register library type (Name/String?) with path (filename/File)

Integrate with "Open Model" as option in dialog to load associated library (select one library from drop down list)