To do 26/11 2021

[AnneSofieSkakIversen]

• Add PV electricity used for heatpump
• tjeck constraints on the new technologies: PV, heat-pump, boiler - some can also be more elegant
• add integer variable to choose size of PV-panel and heat-pump
• currently no upper limit for the boiler and heatpump capacity
• run model with extreme values to test it.
• make the binary variables follow the consumption - binary should be zero if we dont use the technology.