Portaudit pages

[Daniel Staal]

Portaudit was a nice tool, but it's depreciated now.  (And complains loudly 
once it's installed.)  Changing the pages to show how `pkg audit` can do 
the same would probably be good.  (It'd also be nice to have instructions 
on how to install it as part of the periodic script, which portaudit did on 
install, but isn't part of the install of pkg.)

Daniel T. Staal

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