doco @copying

[Kevin Ryde]

I'd like to propose

        * guile.texi: Use @copying, show copyright and permissions at start of
        info and html.

@copying has the important effect of getting copyright and permissions
notices into all output files, meaning each info and html subfile.  It
also allows the copyright notice to be positioned nice and prominently
at the top of the .texi file.  The texinfo NEWS file and manual has
more about this, it's a strongly recommended update for all gnu
manuals.

The change I'm proposing also puts that copyright and permissions into
the first node of the info and html output, so a user reading with a
normal browser will see it.  The node is slightly bloated by this, but
I think it's important information and deserves to be visible.

(If the license is changed to the FDL at some stage then that initial
verbiage is reduced to one paragraph.)

guile.texi.copying.diff
Description: Text document