Issue: Attach Feeds to Other Nodes/Pages

Feeds are great for creating lists and other things, we can currently associate feeds at the area, index, or user level. But I see a lot of applications if we could attach feeds at the page level. In this way we could put lists of photos related to a page, lists of related pages, etc (it will be really great if we update feeds to allow other contents than just wiki pages to be attached -- forum attachments anyone? -- but that's a separate request altogether).

So we could have a pre-defined feeds option in the admin panel. You can set a feed as a separate tab or to just appear in a List of Feeds tab. Of course there would be different permissions for adding/updating page-level feeds.

Every page could have a unified feed. Every page could have a widget, showing the most recent updates from the unified feed.

That's about it. This somewhat major feature is slated for before 4.1 because it needs to be completed in order to close this data-loss bug: https://www.vaultwiki.org/issues/3526/
Since it was possible to have "Group Photos" in vBulletin-related wiki groups. The only option with the most similar behavior would be if we had a feed of the photos attached to the group.