overlayed_lines_v2.patch: 
- make sure that lines overlaying roads have the same points after short-arc-removal. 
- make sure that lines overlaying roads are removed when the "mkgmap:set_unconnected_type" feature changed the road to a line or removed the road
- adapted unit tests

git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@2599 25d90789-57f7-4ee0-8453-03a3dfeeeb22