Mantissa

- A sort direction parameter has been added to the search API.
- Further scrolltable refactoring, improving the UI, creating placeholder
rows faster, and awareness of row removal in the placeholder model.

- Scrolltable now supports conditionally enabled actions.
- Search now handles charsets properly.
- People are now sorted by last name.

- Mantissa no longer depends on Xapian.
- Password reset link fixed.
- An API for setting liveform values from javascript has been added.
- Scrolltable has been reverted to the previous version for performance
reasons.

- Better looking scrolltables.
- Liveform success notification is now faster.

- Login and signup are now done over HTTPS when available.

- Signup form now generates valid email localparts for usernames, and
doesn't allow invalid usernames to be submitted.
- Client-side actions API added for scroltables.
- Searching fixes; indexed items can now control how they're sorted.