adapted tests to improved bt model, refs #1249

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16245 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fixing bt subsecond results, refactoring, refs #12, #1249

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16246 29f149b2-0c63-11e1-8f5c-a347f6a9acd0