nsString& operator+=(const nsString& aString)     {return Append(aString,(PRInt32)aString.mLength);}
nsString& operator+=(const char aChar)            {return Append((PRUnichar) (unsigned char)aChar);}
  nsString& operator+=(const nsString& aString)     {return Append(aString,(PRInt32)aString.mLength);}