Pick a area kind for hallways too (they sometimes will get converted to normal rooms).
Began work on connection logic, in particular handling the hallways.
More work on hallway connections...
SEED_CLASS : updated mid_point() method to handle diagonal seeds.
Hallway : actually create the connection (find a location to connect for
each of the two other rooms).
1. add a green_armor entity to show connections (dummy_arch)
2. factored out property setting code --> dummy_properties
a few fixes....