Depreciate and remove gbde

[NGie Cooper]

> On Oct 20, 2015, at 00:29, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> 
> --------
> In message <201510200645.t9K6jaam004092 at mech-as222.men.bris.ac.uk>, Anton Shterenlikht writes:
>>> GBDE is for when the user is in danger.
>> 
>> In danger of what?
>> Please elaborate.
> 
> Read the paper:
> 
> 	http://phk.freebsd.dk/pubs/bsdcon-03.gbde.paper.pdf
> 
> Or use the TL;DR version in the slides:
> 
> 	http://phk.freebsd.dk/pubs/bsdcan-04.slides.gbde.pdf

Thank you for the pointers. This should be summarized in the documentation though, if it’s worth noting.
Cheers,
-NGie