v3
This patch is getting serious!
To reduce the number of short arcs that are being generated at tile
boundaries, this now clips the ways before the short arc removal is
done. However, it isn't a perfect solution because some map data is
very hard to deal with:
a - If a way crosses a tile
Blast, just discovered that clipping all ways before doing short arc
removal breaks polygons that straddle tile boundaries. The problem is
that at the time the clipping is done, it is not known whether the way
is a line or a polygon. Oh well, back to square one.
