[Tile-serving] Performance of COORDS at updates

[Robert Buchholz]

(I was using this mailing list in digest mode, and couldn't find a way 
to directly reply to the messages of Paul and Lynn in that mode).

As Lynn pointed out, updates themselves are not yet implemented in 
COORDS. However, all data structures to support updates are in place 
(flat files of all node, way and relation data, indexed by their 
respective entity id). The six hours for data import already include 
writing out these files (about 191GB for a planet dump) as well as 
creating the actual geometry tiles.