* Create separate database views for “unseen” and “unread” messages.
* Add “unseen tracking” to info and error messages.
* Rationalize “timestamp” vs. “receipt timestamp”.
* Ensure microsecond precision for interaction sorting.
* Add OWSFail() macros.
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This would especially affect users with large databases on older
devices.
Some of these database extensions aren't strictly necessary to launch
the app. Theoretically we could see weird read receipt behavior for
the initial 10-30 seconds after the app is launched for first time.
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* By providing a view extension for secondary devices we can use that in
a view mapping to power our devices view controller, and avoid any race
conditions with uncommitted transactions.
* Fix crash when you're not in your own contacts
* New device appears on top
* Don't show "edit" button unless there are devices, or rather, the helpers to do so.
* Fix glitchy refresh
Saving unchanged records was causing the tableview to redraw, which was
mostly invisible, except that if the refresh indicator were running, it
would twitch.
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