RF24 moved to utility folder of library. This results in one less include in sketches!

Serial flush in sleep method also means one less code in examples.
Removed set(bool) in message. Not needed. getBool just calls getInt
__attribute__((packed)) for RPI compability
Print more info in send/read debug prints.
Get internalTemp returns full degrees and uses longer Vref delay
Fix debug print gateway prepend (wrong command/type)
Fixed problem in RelayWithButton example. Now working with ack in both directions.
Serial protocol changed (incoming serial message have an new ack-parameter)

libraries/MySensors/examples/WaterMeterPulseSensor/WaterMeterPulseSensor.ino

@@ -10,7 +10,6 @@
 //
 
 #include <SPI.h>
-#include <RF24.h>
 #include <MySensor.h>  
 
 #define DIGITAL_INPUT_SENSOR 3                  // The digital input you attached your sensor.  (Only 2 and 3 generates interrupt!)
@@ -19,7 +18,7 @@
 #define MAX_FLOW 40                             // Max flow (l/min) value to report. This filetrs outliers.
 #define INTERRUPT DIGITAL_INPUT_SENSOR-2        // Usually the interrupt = pin -2 (on uno/nano anyway)
 #define CHILD_ID 5                              // Id of the sensor child
-unsigned long SEND_FREQUENCY = 20;              // Minimum time between send (in seconds). We don't want to spam the gateway.
+unsigned long SEND_FREQUENCY = 20000;           // Minimum time between send (in milliseconds). We don't want to spam the gateway.
 
 MySensor gw;
  
@@ -104,8 +103,7 @@ void loop()
   }
   
   if (SLEEP_MODE) {
-    delay(300);                                                       //delay to allow serial to fully print before sleep
-    gw.sleep(SEND_FREQUENCY * 1000);
+    gw.sleep(SEND_FREQUENCY);
   }
 }