Use multiformed ranges in kamaki pithos lib
Refs: #4059
Also, adjust corresponding unit and functional tests
Tide up sopme functional test code
Pithos client understands more range expressions
Let argument.rangeArgument parse more ranges
Show user names in /file sharers
Refs: #4203
Allow upload_from_string to use content-encoding
Do not allow thread exceptions to stop errors
Guess mimetype and use it in uploads
Refs: #4196
Fix some spelling and typoes in docs
Allow image_register to accept a location tuple
Refs: #3778
Location tuple: (user_uuid, container, image_object)
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