added person menu option for drawing walkingarea path refs #36

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17419 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
minor addendum to previous checkin refs #36

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17420 29f149b2-0c63-11e1-8f5c-a347f6a9acd0