+ Started on MPI
 + Config has the isMaster function
	* MPI rank 0 will perform rendering
	* All other "slave" processes will perform local body simulaions
	  that will not nessecarily be rendered
 + All cameras are now renderable, and in AbstractCamera you can find
   their position and direction
 + RayTracing have their own buffer, such that body original color
   is rendered in addition with the shadows