Add seealso strings to list- related functions.

[John W. Eaton]

On 14-Jan-2008, Muthiah Annamalai wrote:

| I agree. But also lists are currently the only form of return values 
| from the
| function dir(),

If that's true, then it's a bug as the list data type should not be
used anywhere in Octave itself.

But I see

  octave:1> class (dir)
  ans = struct

with Octave 3.x.  In what case does it return a list for you?

jwe