Improve Scheduling / Job handling

There is rudimentary support for scheduling jobs and a very simple version of a job list that displays past runs and their status. This issue tracks all future work to improve both scheduling and job handling.

• Visually improve the Job list so it becomes easier to see the status of a job (JTable instead of JList, colours, filter by status, ...)
• Only allow to perform statistical tests on jobs that have completed
• Allow selecting scheduled jobs and running them consecutively.
• Advanced: Allow saving all results of a single run in an "experiments" folder (graph, optimization TSV, solution viewer, ...)