New options --continue and --only-clone.  Better remote watching of
the status.

* backup-one-task: Handle --only-clone.  Adjusted to the new CLI
  of lysrdiff-set-status.

* lysrdiff-set-status.py
  (open_socket): New function.
  (sendmsg): Use it to simplify code.
  (completion): New function.
  (Top level): New mandatory first argument: --status, --ok, --warning
    or --fail.

* backup-all: Added --continue and --only-clone.

* lysrdiff-monitord.py
  (now): New function.
  (Client.__init__): New API: use sock and peer arguments instead of
    accept_retval.  Renamed the input buffer from __readbuf to
    _readbuf so that derived classes can use it.
  (Client.read_event): Fixed misnamed errno name.  Track name change
    of _readbuf.
  (Client.got_eof): Track name change of _readbuf.
  (Client.write_event): Handle EAGAIN, ETIMEDOUT and EHOSTUNREACH errors.
  (Client.parse): Track name change of _readbuf.
  (Client.handle_cmd): New command: completed.
  (Client.dispatcher): New method.
  (Server.read_event): Track API change of Client.  Set the new client
    socket nonblocking.
  (Vt100Client.__init__): Negotiate telnet to get a raw byte channel
    using WILL ECHO, WILL SuppressGoahead, DO SuppressGoahead.  Use
    vt100 escape sequences to disable line wrap and query the screen
    size.  Don't register with the dispatcher.
  (Vt100Client.parse): New method.  Register with the dispatcher once
    the screen size report has arrived from the client.
  (Dispatcher.toploop): Write the curren time to vt100 clients every
    second.
  (Dispatcher.register_vt100): Position the cursor at the command line
    position.
  (Dispatcher.write_monitor_status): Format the status separately for
    each client, as their screen sizes may vary.
  (Dispatcher.format_monitor_status): New argument: client.
    Position the cursor properly.
  (Dispatcher.set_status): Use now() to simplify code.  Don't crash if
    a client connection is found to be broken.  Format the status
    separately for each client, as their screen sizes may vary.
  (Dispatcher.format_status_vt100): New argument: client.  Truncate
    the status to the line length reported by the client.  Position
    the cursor at the command line position.
  (Dispatcher.completed): New method.

LYSrdiff partitions are now named after both the disk and the
partition, such as "2/0".  Support cloning.  Support watching the
backup activity remotely.  Various other fixes and improvements.

* lysrdiff-status: Adapted to the new disk/part scheme, and the new
  double "--" in state files.  Have a per-user state file, so that
  many users can use this script.

* lysrdiff-set-status.py: New.  Talk to lysrdiff-monitord.py.

* lysrdiff-move-obsolete: New option: --auto-confirm.  Adapted to the
  new disk/part scheme, and the new double "--" in state files.

* lysrdiff-move-job: New.  Move a job from one disk to another.
  (Actually, the old backup copy is left in place.  Use
  lysrdiff-move-obsolete to deal with it.)

* lysrdiff-monitord.py: New.  Keep track of what each disk is doing,
  and provide a vt100-over-telnet interface to watch it remotely.

* lysrdiff-label-disk: New.  Create the lysrdiff.id file and the basic
  directory structure.  Create space filler files that can be removed
  in an emergency.

* lysrdiff-df: New.  Run df on all mounted lysrdiff partitions.

* fetch-backup-work: Fetch all of lenin:/home.

* distribute-tasks: The lysrdiff argument is now on the form
  disk/part.

* Makefile
  (install): Added lysrdiff-label-disk and lysrdiff-df.
  (install-one-task): Added lysrdiff-set-status.py and
    lysrdiff-monitord.

* backup-one-task: Replaced the lysrdiffpart argument with disk and
  part arguments.  Handle --only-prune.  Log status using
  lysrdiff-set-status.py.  Removed special-case remoterdiff for
  sedesopim.  The parts of state file names are now separated by "--"
  intead of "-", to avoid confusion with categories and subcategories
  that contain a "-".  Remove increments older than 120 days.  Log the
  disk usage after a backup completes.  Clone the backup to all
  mounted copies.

* backup-all: Added --only-prune.  The part argument is now a
  disk/part string, and the format of the lysrdiff.id file has
  changed.