implemented new option --lanechange.overtake-right (default false) to switch between german and american overtaking rules. fix #1212. Added additional overtaking tests and a new shared test network

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15994 29f149b2-0c63-11e1-8f5c-a347f6a9acd0