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
Base
Change default GUI
Remove movement at evac center
Improve node coloring (remove the slight delay)
refactoring
Ajout de la découvertes des accidents par les noeuds

Découverte de l'accident lorsque le noeud est sur un map node voisin du map node accidenté
fix null check
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
cleanup
add new message generator for testing purpose
block only X (4 or more -ways) junctions
dijksta efficient computation
update cfg and add new testing cfg using small group of nodes