rem: static void gotoxy(unsigned int new_x,unsigned int new_y)
add: gotoxy(unsigned int new_x,unsigned int new_y)
context: static void gotoxy(unsigned int new_x,unsigned int new_y){	if (new_x>=columns || new_y>=lines)		return;	x = new_x;	y = new_y;	pos = origin+((y*columns+x)<<1);}