Animal - Rework foraging science for multi-grid occupancy

[TaranRallings]

Is your feature request related to a problem? Please describe.
The animal module now allows for multi-grid animal territories. While all the infrastructure is in place, the actual science has not been updated.

Describe the solution you'd like
The Madingley foraging equations need to be combed through to identify and update the places where the logic no longer makes sense.