tweaking default coloring by speed for very fast vehicles to improve visibility refs #36

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15813 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fixing gcc build refs #3

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15814 29f149b2-0c63-11e1-8f5c-a347f6a9acd0