0.9.0b3

Better

• Faces are looked for while someone is there. Someone walking up to a doorbell shows a usable
  face for only a few seconds, often between two checks. When a check finds a person nobody is
  named for, a sensor that recognises faces now checks about every second while they come closer,
  until they are named or gone (half a minute at most, and once per visit).
• The History shows what you taught from it. After naming a person or correcting a box in a
  history frame (or answering a question in Review), its entry says Taught: Ole.
• "Last seen" survives an update or restart. A sensor no longer says Not seen yet about Our
  car or a person it has seen before: when each was last seen comes back from the history.