[patch+doc] New gdbinit.5 man page

[Eli Zaretskii]

> From: Tom Tromey <tromey@redhat.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, gdb-patches@sourceware.org
> Date: Tue, 12 Feb 2013 14:19:55 -0700
> 
> Jan> It is in fact Tom's idea to make the man pages in texinfo:
> 
> I think it is worth doing if it makes maintenance simpler at all.

I just don't see how it will make maintenance simpler.  But I'm
prepared to be convinced ;-)