write(), print(), and println() now return number of bytes written.

The type is long, and negative values indicate errors.  Needs more testing.
http://code.google.com/p/arduino/issues/detail?id=551

LiquidCrystal.h

@@ -79,7 +79,7 @@ public:
 
   void createChar(uint8_t, uint8_t[]);
   void setCursor(uint8_t, uint8_t); 
-  virtual void write(uint8_t);
+  virtual long write(uint8_t);
   void command(uint8_t);
 private:
   void send(uint8_t, uint8_t);