Collection links 588

@afred: There's a lot going on here, and I have probably made some bad calls: let me know.

Unless this is going to a really wrong direction, I would like to get at least this much into trunk and deployed. After that, there are three areas that will improve this aspect of the site:
- Better connections between objects.
- Think about whether to apply something like this to all series.
- Think about what we want for the weird collections: NTW, from-the-vault, vietnam, and maybe the computer series should get a special focus.