Add seealso strings to list- related functions.

[John W. Eaton]

On 14-Jan-2008, Muthiah Annamalai wrote:

| Again, turns out I was mistaken. I wrote code like,
| 
| x = dir();
| 
| x.name(1)
| x.isdir(1)
| 
| etc, which werent working. I must have used x(1).name, x(1).isdir etc
| which is the correct way, I learnt on seeing dir.m
| 
| I used x.name, x.isdir by converting them to lists, and such. Which is
| why I had this convoluted way of reasoning it may help.

Given a struct array like X above,

  x.field

produces a comma-separated list, which is different from a list
object.  A comma-separated list can only be displayed, used as an
argument list for another function, or used to construct a cell array
or matrix with the {} or [] operators.

Maybe we should change the way comma-separated lists are displayed to
help avoid the confusion.

jwe