Add SOS movement

Not working for random walk yet.
cleanup
support partiel pour random walk
Optimisation
fix pour shortest
essai fix pour random walk
fix number of accidents
Merge branch 'sosmode' of https://github.com/davidsan/one into node-map-context

Conflicts:
	core/DTNHost.java
	danger_settings.txt
	movement/DangerMovement.java
	movement/RandomPathMapBasedMovement.java
	movement/ShortestPathMapBasedPoiMovement.java