If for a boundary the place_type is defined, handle the address
part like a place node. This is the same behaviour as before
when class/type where patched earlier.
Introduces new AddressDetails class which is responsible
for address lookups. Saves always the complete result
and then allows filtering throught the different access
function. Remove special handling in Geocode() and use
there the lookup throught PlaceLookup() as well.
