Some improvements to JE2013 refs #1045

* no longer planning to be overtaken by blocking followers on the right when on an uncongested motorway (and --lanechange.overtake-right=false)
* sending speed request to non-blocking followers to ensure they remain non-blocking in subsequent steps
* when deciding on overtaking a blocking leader, the braking on approach to a dead end is now taken into account
* when deciding whether a blocking follower on the left should slow down, a new heuristic for determining on-ramp situations is used (see #1432)


git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17057 29f149b2-0c63-11e1-8f5c-a347f6a9acd0