Cumulative PV generation years PV lifetime instead of modelling period

[BenWinchester]

Discussed in #196

^{Originally posted by palomaortegaa February 22, 2023}

Describe the bug

Cumulative PV generation output was for 20 years instead of modelling period

Expected behaviour

Cumulative PV generation should use modelling period instead of PV lifetime

Additional Information

Desktop

(please complete the following information)

• OS: all
• Installation setup: downloaded source from Github
• Version: 5.0.7b2
• Branch, if relevant: master