widths of internal lanes now change correctly depending on their target lane width

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15347 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
lane color scheme based on vClass now gives fine-grained control via bitmasks refs #36

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15348 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
typo in comment refs #22

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15349 29f149b2-0c63-11e1-8f5c-a347f6a9acd0