fixing collisions with partial occupators in iTETRIS refs #1401. others remain

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16890 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
patching expected results after [16890] refs #21

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16891 29f149b2-0c63-11e1-8f5c-a347f6a9acd0