Provide links to users and content in dashboard and latest-entries sidebar
This should display the last content modifications based on changelog, but doesn't
Displaying recent changes based on changelog now working
Limit changelog aside to current entry in editcontent

When editing an individual content item, the changelog-based history
sidebar only displays changes to the current item.
Rudimentary changelog overview
WIP
404 for invalid changelog entry ID
Nicer changelog UI
Flip through changelog entries per content item
Inner join that makes more sense than left join
Cosmetic fixes