Postprocessing of input and settings

This is a module, that should acivate after the settings are read in from file. Check, if given options are contradictory or not meaningful s.t. they can maybe crash the solver.

This is a rolling issue, since once a new option is set, one has to make sure, that the postprocessing is done correctly.

This issue deals with:

• Creating a framework to include future postprocessings
• Preconfigures some Error Messages for wrong inputs