fixed bug when scaling multi-lane edges in mesosim, refactored for speed refs #1413

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16959 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
now checking vehicle size before drawing meso vehicles which greatly increases drawing speed. refs #36

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16960 29f149b2-0c63-11e1-8f5c-a347f6a9acd0