After 6cc6cf950c names and house numbers
of POIS got mingled into a single item when creating the display name.
Add the house number as extra information without place_id to avoid
later mangling.
The order of preference is now:
1. a post code on the place itself
2. a post code area in the address
3. the computed postcode from the place
Fixes#1723.
Removes the special casing for boundaries with a place
type in get_addressdata(). Instead the place type is now
returned as an extra field, so that the caller has to
handle the situation.
This fixes the details link next to the address in the details
view, which previously would go to a place class instead of the
original boundary class.
