Add seealso strings to list- related functions.

[John W. Eaton]

On 14-Jan-2008, Muthiah Annamalai wrote:

| I would like to propose a patch to add seealso strings to
| list- related functions like list, nth, reverse, append and splice.
| It helps users to know how to deal with lists, as lists are almost
| impervious to any operations on them, except through the 5
| functions. This patch helps cross reference the functions.

Lists are also obsolete (use cell arrays instead).  So rather than
improving the documentation for them, I think we should probably
officially deprecate them and plan to remove them from a future
version of Octave.

jwe