Register group proposal

[Andrew Cagney]

Nick Duffek wrote:

> I think there should be explicit agreement by the GDB community before we
> adopt such an unusual standard.  Maybe there has been, though, and I've
> missed it.

This convention was agreed to some two years ago when gdbarch and ui-out
were started.  True it wasn't added to the gdbint.texinfo file (back
then nothing was being added to that file :-( ) and some of the
discussion may have occured privatly.  However, since then, I've never
been presented with a compelling argument to to drop this convention and
start down a new random path.

As for the idea, It is lifted from old UNIX header files.

	enjoy,
		Andrew