bug#16333: 24.3.50; Info manuals: link defined terms to their glossary entries

[Drew Adams]

> > Actually, I've done this now.  I added it to info+.el.
> > (It could of course be added to vanilla Emacs also.)
> 
> Could you prepare a patch?

I won't prepare a patch till you've tried the
enhancement and decided that you want it.

Been bit too many times by wasting time preparing
patches that don't get applied because the feature
isn't wanted.  If you want this I can provide it,
but decide first that you want it, please.

And I'd really prefer to include other fontifying
Info+ allows, fontifying options and commands, and
the `Toggle/Cycle' submenu of Info for them.

It's simple to take a look: load info+.el in
`emacs -Q' and move around.  For most fontifying
enhancements, try a manual such as Elisp, which
has lots of Lisp artifacts (backquoted sexps, etc.).