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"kamaki file cat" can now output data as they are being downloaded
It is also safe to pipe it
The new library method "stream_down" is implemented in
    "kamaki.clients.PithosClient" and it sequentially downloads
    parts of a remote object to a buffer, which is then written to
    the destination. The destination descriptor is prepared and
    provided by the caller (i.e., "kamaki file cat"). Each part of
    the object is downloaded asynchronously, though.

Used flake8 to check for pep8 errors

The term "different account" refers to a user account that is not
the same as the one running the request.

The most notable example is when user A uploads something to a
directory owned by user B, provided user B has granted write
permissions to user A.

The new logging level DEBUGV is set in "kamaki.clients" and it is
used to log verbose information related to ReST communication.

The CLI is changed accordingly.

Refs grnet/kamaki#96

Affects the class "kamaki.clients.pithos.PithosClient" and more
specifically the methods "get_object_hashmap", "download_object"
and "download_to_string".

All affected methods will now accept an optional placeholder
"headers" dict as a parameter.

Download progress bar was using the number of missing blocks as
its length.
It now uses the total number of blocks in the file, instead.

Fixes #24

Refs #9

This change affects both the kamaki.cli and kamaki.clients hierarchies
It is of semantic significance only
Backwards compatibility is preserved in kamaki.clients, so that
old code using base_url instead of endpoint_url will still work.

Bug: pithos.PithosClient.append_object failed to find and join the
last thread

Introduce the "headers_to_quote" and "header_prefices" properties
in RequestManager class. Modify the class so that only matching
API-specific header values are encoded and quoted.

- Add optional argument --project in command "file create"
- Add command "file reassign"

Refs: #5160

Refs: #5150

Refs: #5002

Also, decorate kamaki.clients.astakos.AstakosClient to raise this new class
when an error occurs

Refs: #4871

Fstat was used to compute the actual file size in order to
distinguish if an empty read was because the file ended.
It now considers an empty read to be an end of file.

This allows reading non-regular files.

Refs: #4871

Fstat was used to compute the actual file size in order to
distinguish if an empty read was because the file ended.
It now considers an empty read to be an end of file.

This allows reading non-regular files.

Refs: #4583

Refs: #4340

Refs: #4441

This example involves astakos, pithos, image and cyclades clients
It also shows how to use kamaki.cli.config to get cloud information
It attempts to create a cluster of VMs from a user-created image,
from scratch.

Refs: #4059

Also, adjust corresponding unit and functional tests

Refs: #4059