A few new features for `port`

[Jeremy Lavergne]

> When you want to see which ports you _could_ remove, that aren't
> depended on by anything else.
> There are times when you may have installed a port as a trial and no
> longer need it to be installed.
> In this case, it may simply be better to include an option for leaves
> which doesn't exclude the requested ports (possibly also marking those
> that were or weren't specifically requested).

Including the 'requested' versus 'automatically installed' flag into the sqlite db would be very handy at this point.

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