Batch mode

[Konrad1991]

• [x] User should set number of max cores
• [x] Each core has to calculate one or more optimizations
• [x] Add extra argument to PSO which gets printed --> this is e.g. File Nr. 1 Repetition 1
• [x] Define function which starts a background R process which sequentially conduct the desired optimizations
• [x] Update printing of status
• [x] Update gathering of results --> seperate_batch_results has to be updated. --> Especially how to gather data in case of users press cancel