Radio: Merged OldIRadio and IRadio.
Radio: Removed obsolete getMobility from IRadio.
Radio: Removed obsolete channel number from IRadio.
Radio: Changed TODOs.
Radio: Added propagationSpeed parameter and moved propagation models.
Radio: Separated base classes from generic classes.
Radio: Factored common parts among receivers.
Radio: Removed superfluous virtual destructors (already inherited)
Radio: Removed unused interface (left over from moving layered implmentation)