fixing free speed calculations at insertion and for subseconds, refs #1346

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16664 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
adapting tests to new freespeed calculation, refs #21, #82

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16665 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fixing linux build (also unittests), refs #3

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16666 29f149b2-0c63-11e1-8f5c-a347f6a9acd0