Radio: Renamed directory to neighborcache.

Also renamed class to NeighborListNeighborCache.
Radio: Renamed directory to obstacleloss.
Radio: Renamed directory to energyconsumer.
Radio: Moved to errormodel directory.
Radio: Added print functions to neighbor caches.
Radio: Moved computeNoise and computeSNIR to attenuation.
Radio: Fixed issues detected by valgrind.