Theuderic IV

New minor version mostly because from here on the version will be saved into your .config files.
Also a fix to P1d, this will be used for the final EDR analyses by @corentinravoux.

What's Changed

• Add version to config by @cramirezpe in #1035
• [bump minor] P1d covariance fix by @corentinravoux in #1034

Full Changelog: v8.0.0...v8.1.0