partly revert r3228 & r3229 

Don't combine routable and non-routable lines in WrongAngleFixer.
This causes more distorted lines at crossings with railways (tram)




git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@3230 25d90789-57f7-4ee0-8453-03a3dfeeeb22