Depreciate and remove gbde

[Poul-Henning Kamp]

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In message <20151019234855.4ed82051 at gumby.homeunix.com>, RW writes:

>I certainly wouldn't like to see gbde removed but I think it is
>unfortunate that it's given slightly greater prominence in the handbook
>than geli. geli is the right choice for most people.

This I fully agree with.

GELI is fine if your threatmodel is a stolen laptop.

GBDE is for when the user is in danger.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.