Add non-convex investments
Non-convex investments are possible with oemof 0.4.0: https://forum.openmod-initiative.org/t/oemof-problem-investment-decision/1903/10
Implement them for all components.
Non-convex investments are possible with oemof 0.4.0: https://forum.openmod-initiative.org/t/oemof-problem-investment-decision/1903/10
Implement them for all components.