unnumbered sections numbered

[Karl Berry]

Hi Patrice,

With this input file:
------------------------
\input texinfo
@setfilename unnsec.info
@unnumbered U
@section S
@bye
------------------------

The output looks like:
------------------------
U
*

0.1 S
=====
------------------------

I think S should not have any number, as if it were @unnumberedsec.
C makeinfo did it that way.

(The common install.texi file uses this sort of construct.  The presence
or absence of nodes makes no difference to the output, I left them out
just to make it minimal.)

Wdyt?

Thanks,
Karl