LINZ:building_use and LINZ:building_status need to be added.
see http://wiki.openstreetmap.org/wiki/Building
"building:use=fields.building_use" ? amenity=?
pick out things like schools and hospitals to get the
correct amenity= tag?

see building_pnt for a big switch|case{} to sort the building_use field.
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Glen: Added the mappings from building_pnt
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HB: Chatham Islands uploaded Nov2010