Bug in print2 of Tutorial

[Pearu Peterson]

Hi,

Shouldn't the lines
  n.find_bool(name, x);
  n.find_unsigned(name, x);
  n.find_string(name, x);
in static void my_print2(const archive_node & n); of the Tutorial be
replaced with the following ones:
  n.find_bool(name, x, j);
  n.find_unsigned(name, x, j);
  n.find_string(name, x, j);
?

I noticed that when extracting info from fderivative instance. I was
expecting 'D[0,1](f)(x,y)' but I was getting 'D[0,0](f)(x,y)' from
'f(x,y).diff(x).diff(y)'. The change above fixed this.

As I understand, then all items in property p[i] should be of the same
type. Is this always true?


Regards,
	Pearu