NOTE TO UPLOADERS:

Merge overlapping nodes from the powerline_cl layer as needed. (and existing map features too)

http://wiki.openstreetmap.org/wiki/Map_Features#Power
http://wiki.openstreetmap.org/wiki/Tag:power%3Dtower
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pylon_pnt contains only major pylons as defined in the OSM description. Corresponding powerline_cl have support type = 'pylon'
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HB: do the nodes correspond exactly? (& thus need to be merged)
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RP: can we include the orientation as well? LINZ:orientation. otherwise great
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HB: orientation added
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HB 25 Aug 2012: orientation no longer exists; ignore. Otherwise simple enough, looks good to me but mind the merging.
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Glen wrote on the ML 7 Sep 2012:Agreed power=tower.
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Approved for the mainland.