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/examples/GettingStarted/printf.h

@@ -1,37 +0,0 @@
-/*
- Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
- 
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- version 2 as published by the Free Software Foundation.
- */
- 
-/**
- * @file printf.h
- *
- * Setup necessary to direct stdout to the Arduino Serial library, which
- * enables 'printf'
- */
-
-#ifndef __PRINTF_H__
-#define __PRINTF_H__
-
-#ifdef ARDUINO
-
-int serial_putc( char c, FILE * ) 
-{
-  Serial.write( c );
-
-  return c;
-} 
-
-void printf_begin(void)
-{
-  fdevopen( &serial_putc, 0 );
-}
-
-#else
-#error This example is only for use on Arduino.
-#endif // ARDUINO
-
-#endif // __PRINTF_H__