[Tagging] type for natural=tree (leaved <-> leafed)

[fly]

Hey

Could an BE-speaking person please tell me what the right spelling for
broad_leafed is. Numbers are almost even in the data. Probably, a nice
task for a bot.

On the other hand, I wonder if it is useful to use type=* and not
tree_type=* or tree:type=* as type is the key for relations and it is
not that good to use different meanings of one key.

Cheers
fly