[issue17618] base85 encoding

[Martin Morrison]

Martin Morrison added the comment:

New diff. Changes from the last one:

- change in struct handling to avoid issue14596

- Addition of btoa85 and atob85 functions that do legacy 'btoa' encoding/decoding. These are just wrappers around a85(en|de)code, which now have additional keyword args to control wrapping, padding, framing, and whitespace skipping

- New tests covering all 3 variants

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Added file: http://bugs.python.org/file29911/issue17618-4.diff

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