Version 2.4.0

• Introduces flexible components of the Conversion class. This allows for conversion components that can choose their input or output from different commodities. The share of each commodity can be limited by a flowShare. Emissions can be assigned by emissionFactors specific to a commodity.
• Allow intermittent pathway parameters (e.g., capacityFix). Pathway parameters can now be defined only for single investment periods, while being None for others.
• Fixes bug in models using gurobi.
• Improves data type checking.