misunderstood private virtuals when cleaning code in [16626], changed again, hopefully for the better, refs #12

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16642 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fixing warnings, refs #3

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16643 29f149b2-0c63-11e1-8f5c-a347f6a9acd0