now driving up to the crossing point for linkLeaders with a different target. fix #862 (see comment:11)

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15407 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
patching expected results after [15407] refs #21

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15408 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fixing sumo-gui 'Error: Attribute 'threshold' is missing in definition of a entry' refs #36

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15409 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fix #1131

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15410 29f149b2-0c63-11e1-8f5c-a347f6a9acd0