Implement add button for user list
Implement add button for user list

That's it; that's all it took: thanks to Mongo's "upsert" feature,
we could re-use most of what we did for updates.

The button layout is a bit unintuitive at the moment, and
could probably use a redesign. Maybe the "Save" button
could change itself to "Add" in a context-dependant way?
That's a thought for later.

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