migration handling

[Jeremy Lavergne]

> That sounds like quite a bit less work than I anticipated.
> 
> I also note that there's a script that can perform some of the
> reinstall work. Is there any reason that this couldn't be (hasn't
> already been) incorporated into port? It could be enhanced to include
> requested and active state of ports as well.

It could be nice to have ryan's script in there, however we don't necessarily know where the output file will get stashed. That'd be a bit more tricky, I think. And of course, convincing novices on piping or specifying the file input so they can be reinstalled... it's best to leave that on the site I think, unless we can make it a pretty rigid environment so the file is always stored at a set location.