[talk-au] rendering fords

[John Smith]

Now that I'm less confused about terminology being used I think fords
and floodways/floodplains should be tagged differently, in the case of
fords they can be assumed to be safe to cross when there is water
present, floodways/floodplains/floodprone on the other hand can be
hazardous when water is crossing the road way and I even wrote a page
stub about the latter case:

http://wiki.openstreetmap.org/wiki/Key:flood_prone