When using a linked place as centroid for a boundary, check
first that it is really within the area. If it is outside,
just keep the computed centroid because a centroid outside the
area just causes havok.
Fixes#1352.
If a boundary relation has no label member preferably
link against a place node with the same place type.
Also inherit the rank_address from the place node (only
has an effect when linking via lable member or place type).
