Only scan for relay node max 3 times per transmission attempt (to save battery)

Lower transmission speed to reach longer distances.

Remove RF24 to prepare gittree import.

libraries/RF24/tests/pingpair_blocking/runtest.py

@@ -1,25 +0,0 @@
-#!/opt/local/bin/python
-
-import sys,serial
-
-def read_until(token):
-	while 1: 
-		line = ser.readline(None,"\r")
-		sys.stdout.write(line)
-
-		if (line.startswith(token)):
-			break
-	return line
-
-
-ser = serial.Serial(sys.argv[1], 57600, timeout=5, dsrdtr=False, rtscts=False)
-
-read_until("+READY")
-ser.write(sys.argv[2])
-
-line = read_until("+OK")
-ser.close()
-if (line.find("PASS") != -1):
-	sys.exit(0)
-else:
-	sys.exit(1)