Cooja/DGRM: Allow setting the RSSI value when sending or during silence.
concurrency fix set/get BaseRssi
Fixed the concurrency of the WeakHashMap used by setBaseRssi and getBaseRssi and running the updateSignalStrengths in a Simulation Thread because of concurrency
BaseRSSI plugin added
plugin to view and change the base rssi.
for further implementation of random base rssi generation