Moving ARDUINO_MAIN from main.cpp to wiring_digital.c and hiding PA, PB, etc.

http://code.google.com/p/arduino/issues/detail?id=677
http://code.google.com/p/arduino/issues/detail?id=691

cores/arduino/Arduino.h

@@ -148,6 +148,7 @@ extern const uint8_t PROGMEM digital_pin_to_timer_PGM[];
 #define NOT_A_PIN 0
 #define NOT_A_PORT 0
 
+#ifdef ARDUINO_MAIN
 #define PA 1
 #define PB 2
 #define PC 3
@@ -159,6 +160,7 @@ extern const uint8_t PROGMEM digital_pin_to_timer_PGM[];
 #define PJ 10
 #define PK 11
 #define PL 12
+#endif
 
 #define NOT_ON_TIMER 0
 #define TIMER0A 1

cores/arduino/main.cpp

@@ -1,4 +1,3 @@
-#define ARDUINO_MAIN
 #include <Arduino.h>
 
 int main(void)

cores/arduino/wiring_digital.c

@@ -24,6 +24,7 @@
   $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
 */
 
+#define ARDUINO_MAIN
 #include "wiring_private.h"
 #include "pins_arduino.h"