Log Message:
tahoe-lafs: Update to 1.13.0

Release 1.13.0 (05-August-2018)
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New Features
------------

The ``tahoe list-aliases`` command gained the ``--readonly-uri``
option in `PR400`_, which lists read-only capabilities (the default
shows read/write capabilities if available). This command also gained
a ``--json`` option in `PR452`_, providing machine-readable output.

A new command ``tahoe status`` is added, showing some statistics and
currently active operations (similar to the ``/status`` page in the
Web UI). See also `PR502`_.

Immutable uploads now use the "servers of happiness" algorithm for
uploading shares. This means better placement of shares on available
servers. See `PR416`_.

To join a new client to a grid, the command ``tahoe invite`` was
added. This uses `magic wormhole`_ to connect two computers and
exchange the required information to start the client. The "client
side" of this command is the also new option ``tahoe
create-client --join=``. Together, this provides a way to provision a
new client without having to securely transmit the fURL and other
details. `PR418`_

``tahoe backup`` now reports progress. `PR474`_

The ``tub.port=`` option can now accept ``listen:i2p`` or
``listen:tor`` options to use popular anonymity networks with storage
servers. See `PR437`_

The place where storage servers put shares (the "storage path") is now
configurable (`PR472`_).

A PyInstaller-based build is now available (`PR421`_). A "Docker
compose" setup for development purposes is now available (`PR445`_).

There is now a recommended workflow for Zcash-based donations to support
storage server operators (`PR506`_).

Web UI Changes
--------------

We set the "Referrer-Policy: no-referrer" header on all requests. The
Welcome page now understands the JSON option (`PR430`_) and OPTIONS
requests are handled (`PR447`_).

Magic Folder Changes
--------------------

Multiple magic-folders in a single Tahoe client are now
supported. Bugs with ``.backup`` files have been fixed, meaning
spurious ``.backup`` files will be produced less often (`PR448`_,
`PR475`_). Handling of default umask on new magic-folder files is
fixed in `PR458`_. The user mtime value is now correctly preserved
(`PR457`_).

A bug in ``tahoe magic-folder status`` causing active operations to
sometimes not show up is fixed (`PR461`_). If a directory is missing,
it is created (`PR492`_).