possible addition of global switch to pkg

[Donald Wilde]

Hi, pkg Maintainers --

while doing another install of 12-STABLE, I thought of something
simple that would be a helpful addition to the pkg installer. I was
installing boost-all (from the port, in this case) and I was struck by
the number of times the pkg dialog box popped up with JUST the
checkbox for documentation.

It would be really nice if there was a global switch that would
automagically select for installing (or not installing) the pkg
documentation. -d/-D are available, at least for the pkg install
form... :D

-- 
Don Wilde
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* What is the Internet of Things but a system *
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