Problems with current structure

• Boundary setup is mixed into TopfarmProblem subclasses
• A new design variable can only be added by implementing a new TopfarmProblem subclass
• A new constraint can only be added by implementing a new TopfarmProblem subclass
• In all use cases until now (except dummy examples) we want to maximize instead of minimize. This means that "cost" and "cost_comp" is misleading terms