AntennaRange.cfg: Added isAntenna to the part prefab for all parts with ModuleLimitedDataTransmitters.
AntennaRelay.cs: Added a timer to prevent antennas from re-searching their nearest relay multiple times in a single transmission attempt.
Extensions.cs: Remove IsAntenna stuff because we want that to work without persistence data. Doesn't work yet.
* Changed DataRate to return a very tiny number if the antenna cannot transmit.
* Changed the transmission message to indictor if it is using a relay or not.
* Removed IsAntenna in favor of using the prefab... hopefully.