Many changes - tidying up the extensions interfaces.

Updating the GPIO command - new command - allreadall
ScrollPhat code
max31855 code (tested with adafruit breakout board)
more tests
updated rht03 code

Raspberry Pi v3 support.

wiringPi/drcSerial.c

@@ -1,7 +1,7 @@
 /*
  * drcSerial.c:
  *	Extend wiringPi with the DRC Serial protocol (e.g. to Arduino)
- *	Copyright (c) 2013 Gordon Henderson
+ *	Copyright (c) 2013-2016 Gordon Henderson
  ***********************************************************************
  * This file is part of wiringPi:
  *	https://projects.drogon.net/raspberry-pi/wiringpi/
@@ -32,11 +32,6 @@
 
 #include "drcSerial.h"
 
-#ifndef	TRUE
-#  define	TRUE	(1==1)
-#  define	FALSE	(1==2)
-#endif
-
 
 /*
  * myPinMode:
@@ -156,7 +151,7 @@ int drcSetupSerial (const int pinBase, const int numPins, const char *device, co
   struct wiringPiNodeStruct *node ;
 
   if ((fd = serialOpen (device, baud)) < 0)
-    return wiringPiFailure (WPI_ALMOST, "Unable to open DRC device (%s): %s", device, strerror (errno)) ;
+    return FALSE ;
 
   delay (10) ;	// May need longer if it's an Uno that reboots on the open...
 
@@ -184,7 +179,7 @@ int drcSetupSerial (const int pinBase, const int numPins, const char *device, co
   if (!ok)
   {
     serialClose (fd) ;
-    return wiringPiFailure (WPI_FATAL, "Unable to communicate with DRC serial device") ;
+    return FALSE ;
   }
 
   node = wiringPiNewNode (pinBase, numPins) ;
@@ -197,5 +192,5 @@ int drcSetupSerial (const int pinBase, const int numPins, const char *device, co
   node->digitalWrite    = myDigitalWrite ;
   node->pwmWrite        = myPwmWrite ;
 
-  return 0 ;
+  return TRUE ;
 }