Absolute cover calculations consider wrong area

[VHallerBull]

The function that calculates total_absolute_cover multiplies the relative_cover by the site_k_area. Thsi is not correct, it should be calculated based on the total area of the sites independent of carrying capacity

[ConnectedSystems]

ADRIA stores/conceptualizes relative cover as being relative to habitable area.

Please also see this discussion about standardizing metrics, where relative_cover may be renamed to habitable_cover or similar: #743

[ConnectedSystems]

Also for future reference, it's best to link to the source or use formatted code snippets. Screenshots of code are less useful.