speeding up FCDExport without persons, refs #12

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17140 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
simstep speedup without persons, refs #12

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17141 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
removing unused code, using consistently Position::INVALID, refs #12

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17142 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fixing angle calculation and position caching at lane change, refs #1453

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17143 29f149b2-0c63-11e1-8f5c-a347f6a9acd0