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If encoding is not set (run through an executable made by pyinstaller), set
it to utf-8.

Operate internally only with unicode. Talk to the filesystem with utf8
encoded strings and then decode the retrieved paths to unicode. Refuse to
operate if the assumed filesystem encoding is not utf8.

Create a decorator "ssl_fall_back" which catches a KamakiSSLError,
patches kamaki with the default certificates bundle and reruns the
failed method.

The decorator is used on the "SyncerSettings._get_pithos_client"
method, because this is the first point of SSL failure.

The default certificates bundle is acquired from the package
"certifi", which has been added to dependencies.