emacsclient not working anymore on Mac OS X

[Stephen Eglen]

 > emacsclient --no-wait +100 file.tex
 > emacsclient: can't find socket; have you started the server?

I'm afraid that I can't help answer this question, but it made me
think of the following:

Would it be a good idea for this error message to explain how to start
the server within Emacs?  You might think that because someone has
used emacsclient, they must know to do M-x server-start before hand.
However, in ESS (Emacs speaks statistics), emacsclient is used to
allow running statistical processes to use Emacs to edit various
objects.  So it it possible that an Emacs user may not yet know
about calling server-start.  Perhaps ESS should ensure (server-start)
is called, but regardless I think having an extra line in the error
might be helpful. e.g.:

 emacsclient: can't find socket; have you started the server?
 To start the server in emacs, type "M-x server-start".

Any objections to me checking this into lib-src/emacsclient.c?

Stephen