[JDEV] Privacy mode

[Oliver Wing]

> Not necessary; you should _never_ manually send such presence packets
> directly to other users. Simply use type=unavailable when sending the
> _server_ your presence, just as you would normally use the default type
> (available) or "dnd" or whatever.

i disagree with this. You can of course send presence packets to individual
users. Indeed, if they aren't on your roster, this is the only way you can
do so. It also gives you the ability to control what presence gets sent to
individual users.