correction: Coord.shortestDistToLineSegment sometimes returned 
too large values, esp. for points far from the equator.

Expected effect of the change: Small improvements in the DouglasPeuckerFilter as it is more likely keeping the right
points.





git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@3391 25d90789-57f7-4ee0-8453-03a3dfeeeb22