Internetarchive

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**Features and Improvements**

- Added check to ``ia upload`` to see if the collection being uploaded to exists.
Also added an option to override this check.

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**Features and Improvements**

- Fixed append to work like a standard metadata update if the metadata field
does not yet exist for the given item.

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**Bugfixes**

- Encode filenames in upload URLs.

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**Bugfixes**

- Fixed bug in ``internetarchive.config.get_auth_config`` (i.e. ``ia configure``)
where logged-in cookies returned expired within hours. Cookies should now be
valid for about one year.

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- Output error message when downloading non-existing files in ``ia download`` rather
than raising Python exception.
- Fixed IOError in ``ia search`` when using ``head``, ``tail``, etc..
- Simplified ``ia search`` to output only JSON, rather than doing any special
formatting.
- Added experimental support for creating pex binaries of ia in ``Makefile``.

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- Simplified ``ia configure``. It now only asks for Archive.org email/password and
automatically adds S3 keys and Archive.org cookies to config.
See ``internetarchive.config.get_auth_config()``.