Zones as the only spatial concept

The spatial model in Aquila started with rooms and floors as well as zones. The current one has a single concept.

A zone is a box in three dimensions: an origin and an extent, in metres, in one frame for the whole home. A room is a zone. A floor needs no type of its own, because it is just a value of z in the home frame.

Presence, person count and vitals are reported per zone.

The cost was a breaking change: topology files written for the old model do not load in the new one, and the tests that placed simulated people had to move them to match zone origins.