Log Message:
Update to 212, based on patch by agc.

  Fixed another bug in check_updates.
  Fixed bug in check_updates.
  Fixed bug in setting default startdate and stopdate for the
  unscheduled view.
  Documentation tweaks.
  Bug fixes. Unscheduled now treated as a view parallel to agenda
  and list.
  Added 'e' column to display. Tweaks.
  Unscheduled time support. Added earliest, latest, minimum, extent
  (default event length) to rc.py. Use -u for the command line or
  u for the gui. Entering '.' now cancels any operation which calls
  for a response to a prompt. ? brings up the help screen in
  non-editing mode.
  Added column for 'e'. Gui entry for @e now supports entering
  either a time or an integer number of minutes.
  Added freetime.py. About to fiddle with adding a column for 'e'.