[Routing] handle zooming far out

[Nic Roets]

Gosmore generates a separate low zoom vector map that only contains motorway
and coastlines (objects with a large scalemax parameter). One of the
problems I still have this approach is simplifying objects so that you don't
have to draw thousands of segments without leaving out long segments. I also
want to increase the number of zoom maps to more than 2 (lowzoom and
normal).

One of the interesting things I considered, but did not implement was to
store the simiplified map inside an empty part the main map, e.g. somewhere
in the Pacific ocean.
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